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Alexis Heitzmann, George Zhou, Samuel N. Quinn, Chelsea X. Huang, Jiayin Dong, L. G. Bouma, Rebekah I. Dawson, Stephen C. Marsden, Duncan Wright, Pascal Petit, Karen A. Collins, Khalid Barkaoui, Robert A. Wittenmyer, Edward Gillen, Rafael Brahm, Melissa Hobson, Coel Hellier, Carl Ziegler, César Briceño, Nicholas Law, Andrew W. Mann, Steve B. Howell, Crystal L. Gnilka, Colin Littlefield, David W. Latham, Jack J. Lissauer, Elisabeth R. Newton, Daniel M. Krolikowski, Ronan Kerr, Rayna Rampalli, Stephanie T. Douglas, Nora L. Eisner, Nathalie Guedj, Guoyou Sun, Martin Smit, Marc Huten, Thorsten Eschweiler, Lyu Abe, Tristan Guillot, George Ricker, Roland Vanderspek, Sara Seager, Jon M. Jenkins, Eric B. Ting, Joshua N. Winn, David R. Ciardi, Andrew M. Vanderburg, Christopher J. Burke, David R. Rodriguez, Tansu Daylan |
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TOI-4562b: A Highly Eccentric Temperate Jupiter Analog Orbiting a Young Field Star |
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Year |
2023 |
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The Astronomical Journal |
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165 |
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3 |
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121 |
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We report the discovery of TOI-4562b (TIC-349576261), a Jovian planet orbiting a young F7V-type star, younger than the Praesepe/Hyades clusters (<700 Myr). This planet stands out because of its unusually long orbital period for transiting planets with known masses (P orb = 225.11781 days) and because it has a substantial eccentricity (e = 0.76). The location of TOI-4562 near the southern continuous viewing zone of TESS allowed observations throughout 25 sectors, enabling an unambiguous period measurement from TESS alone. Alongside the four available TESS transits, we performed follow-up photometry using the South African Astronomical Observatory node of the Las Cumbres Observatory and spectroscopy with the CHIRON spectrograph on the 1.5 m SMARTS telescope. We measure a radius of R J and a mass of 2.30 M J for TOI-4562b. The radius of the planet is consistent with contraction models describing the early evolution of the size of giant planets. We detect tentative transit timing variations at the ∼20 minutes level from five transit events, favoring the presence of a companion that could explain the dynamical history of this system if confirmed by future follow-up observations. With its current orbital configuration, tidal timescales are too long for TOI-4562b to become a hot Jupiter via high-eccentricity migration though it is not excluded that interactions with the possible companion could modify TOI-4562b’s eccentricity and trigger circularization. The characterization of more such young systems is essential to set constraints on models describing giant-planet evolution. |
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1538-3881 |
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8647 |
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Trifon Trifonov, Rafael Brahm, Andrés Jordán, Christian Hartogh, Thomas Henning, Melissa J. Hobson, Martin Schlecker, Saburo Howard, Finja Reichardt, Nestor Espinoza, Man Hoi Lee, David Nesvorny, Felipe I. Rojas, Khalid Barkaoui, Diana Kossakowski, Gavin Boyle, Stefan Dreizler, Martin Kürster, René Heller, Tristan Guillot, Amaury H. M. J. Triaud, Lyu Abe, Abdelkrim Agabi, Philippe Bendjoya, Nicolas Crouzet, Georgina Dransfield, Thomas Gasparetto, Maximilian N. Günther, Wenceslas Marie-Sainte, Djamel Mékarnia, Olga Suarez, Johanna Teske, R. Paul Butler, Jeffrey D. Crane, Stephen Shectman, George R. Ricker, Avi Shporer, Roland Vanderspek, Jon M. Jenkins, Bill Wohler, Karen A. Collins, Kevin I. Collins, David R. Ciardi, Thomas Barclay, Ismael Mireles, Sara Seager, Joshua N. Winn |
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Title |
TOI-2525 b and c: A Pair of Massive Warm Giant Planets with Strong Transit Timing Variations Revealed by TESS* |
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Journal |
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Year |
2023 |
Publication |
The Astronomical Journal |
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Volume |
165 |
Issue |
4 |
Pages |
179 |
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The K-type star TOI-2525 has an estimated mass of M = M ⊙ and radius of R = R ⊙ observed by the TESS mission in 22 sectors (within sectors 1 and 39). The TESS light curves yield significant transit events of two companions, which show strong transit timing variations (TTVs) with a semiamplitude of ∼6 hr. We performed TTV dynamical and photodynamical light-curve analysis of the TESS data combined with radial velocity measurements from FEROS and PFS, and we confirmed the planetary nature of these companions. The TOI-2525 system consists of a transiting pair of planets comparable to Neptune and Jupiter with estimated dynamical masses of m b = and m c = M Jup, radii of r b = and r c = R Jup, and orbital periods of P b = and P c = days for the inner and outer planet, respectively. The period ratio is close to the 2:1 period commensurability, but the dynamical simulations of the system suggest that it is outside the mean-motion resonance (MMR) dynamical configuration. Object TOI-2525 b is among the lowest-density Neptune-mass planets known to date, with an estimated median density of ρ b = g cm−3. The TOI-2525 system is very similar to the other K dwarf systems discovered by TESS, TOI-2202 and TOI-216, which are composed of almost identical K dwarf primaries and two warm giant planets near the 2:1 MMR. |
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1538-3881 |
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yes |
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8646 |
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Jennifer A. Burt, Diana Dragomir, Paul Mollière, Allison Youngblood, Antonio García Muñoz, John McCann, Laura Kreidberg, Chelsea X. Huang, Karen A. Collins, Jason D. Eastman, Lyu Abe, Jose M. Almenara, Ian J. M. Crossfield, Carl Ziegler, Joseph E. Rodriguez, Eric E. Mamajek, Keivan G. Stassun, Samuel P. Halverson, Steven Villanueva, R. Paul Butler, Sharon Xuesong Wang, Richard P. Schwarz, George R. Ricker, Roland Vanderspek, David W. Latham, S. Seager, Joshua N. Winn, Jon M. Jenkins, Abdelkrim Agabi, Xavier Bonfils, David Ciardi, Marion Cointepas, Jeffrey D. Crane, Nicolas Crouzet, Georgina Dransfield, Fabo Feng, Elise Furlan, Tristan Guillot, Arvind F. Gupta, Steve B. Howell, Eric L. N. Jensen, Nicholas Law, Andrew W. Mann, Wenceslas Marie-Sainte, Rachel A. Matson, Elisabeth C. Matthews, Djamel Mékarnia, Joshua Pepper, Nic Scott, Stephen A. Shectman, Joshua E. Schlieder, François-Xavier Schmider, Daniel J. Stevens, Johanna K. Teske, Amaury H. M. J. Triaud, David Charbonneau, Zachory K. Berta-Thompson, Christopher J. Burke, Tansu Daylan, Thomas Barclay, Bill Wohler, C. E. Brasseur |
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Title |
TOI-1231 b: A Temperate, Neptune-sized Planet Transiting the Nearby M3 Dwarf NLTT 24399 |
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Year |
2021 |
Publication |
The Astronomical Journal |
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Volume |
162 |
Issue |
3 |
Pages |
87 |
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We report the discovery of a transiting, temperate, Neptune-sized exoplanet orbiting the nearby (d = 27.5 pc), M3V star TOI-1231 (NLTT 24399, L 248-27, 2MASS J10265947-5228099). The planet was detected using photometric data from the Transiting Exoplanet Survey Satellite and followed up with observations from the Las Cumbres Observatory and the Antarctica Search for Transiting ExoPlanets program. Combining the photometric data sets, we find that the newly discovered planet has a radius of and an orbital period of 24.246 days. Radial velocity measurements obtained with the Planet Finder Spectrograph on the Magellan Clay telescope confirm the existence of the planet and lead to a mass measurement of 15.5 ± 3.3 M ⊕. With an equilibrium temperature of just 330 K, TOI-1231 b is one of the coolest small planets accessible for atmospheric studies thus far, and its host star’s bright near-infrared brightness (J = 8.88, K s = 8.07) makes it an exciting target for the Hubble Space Telescope and the James Webb Space Telescope. Future atmospheric observations would enable the first comparative planetology efforts in the 250–350 K temperature regime via comparisons with K2-18 b. Furthermore, TOI-1231's high systemic radial velocity (70.5 km s−1) may allow for the detection of low-velocity hydrogen atoms escaping the planet by Doppler, shifting the H i Lyα stellar emission away from the geocoronal and interstellar medium absorption features. |
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1066 |
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1538-3881 |
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yes |
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8196 |
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Udisti R., S. Becagli, E. Castellano, O. Cerri, F. Marino, A. Morganti, F. Rugi, M. Severi, R. Traversi.si. |
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Today and past climate-environment feedback processes from temporal trends of selected markers of bio-geo-chemical cycles in antarctic depositions. |
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Conference - National - Communication |
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2007 |
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Congresso Nazionale di Chimica degli Ambienti Polari, Venezia, Giugno 2007 |
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1181 |
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5437 |
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Fahlman A., Schmidt A., Jones D.R., Bostrom B.L. & Y. Handrich |
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Title |
To what extent might N2 limit dive performance in king penguins? Journal of Experimental Biology. |
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Journal Article |
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2007 |
Publication |
Journal of experimental biology |
Abbreviated Journal |
J. Exp. Biol. |
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210 |
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3344-3355 |
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394 |
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0022-0949 |
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yes |
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4553 |
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Gilbert C., Le Maho Y., Beaulieu, M. & Ancel A. |
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To what extent is the huddling behaviour of emperor penguins influenced by meteorological factors? |
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Conference - International - Poster |
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2006 |
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colloque “3ème journée du CNFRA”, Paris (France), 4-5 octobre |
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137 |
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yes |
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5104 |
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Tartu Sabrina, Goutte Aurélie, Bustamante Paco, Angelier Frédéric, Moe Børge, Clément-Chastel Céline, Bech Claus, Gabrielsen Geir Wing, Bustnes Jan Ove, Chastel Olivier, |
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Title |
To breed or not to breed: endocrine response to mercury contamination by an Arctic seabird
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Journal Article |
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2013 |
Publication |
BIOLOGY LETTERS |
Abbreviated Journal |
1744-9561 |
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9 |
Issue |
4 |
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black-legged kittiwake, GnRH challenge, intermittent breeding, luteinizing hormone, mercury, |
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Mercury, a ubiquitous toxic element, is known to alter expression of sex steroids and to impair reproduction across vertebrates but the mechanisms underlying these effects are not clearly identified. We examined whether contamination by mercury predicts the probability to skip reproduction in black-legged kittiwakes (Rissa tridactyla) from Svalbard. We also manipulated the endocrine system to investigate the mechanism underlying this relationship. During the pre-laying period, we injected exogenous GnRH (gonadotropin-releasing hormone) to test the ability of the pituitary to release luteinizing hormone (LH, a key hormone for the release of sex steroids and hence breeding) in relation to mercury burden. Birds that skipped reproduction had significantly higher mercury concentration in blood than breeders. Endocrine profiles of these birds also varied based on breeding status (breeders versus non-breeders), mercury contamination and sex. Specifically, in skippers (birds that did not breed), baseline LH decreased with increasing mercury concentration in males, whereas it increased in females. GnRH-induced LH levels increased with increasing mercury concentration in both sexes. These results suggest that mercury contamination may disrupt GnRH input to the pituitary. Thus, high mercury concentration could affect the ability of long-lived birds to modulate their reproductive effort (skipping or breeding) according to ongoing environmental changes in the Arctic, thereby impacting population dynamics. |
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330 |
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Bachelor's thesis |
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1744-9561 |
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yes |
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4418 |
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Cook T., Lescroël A., Tremblay Y., Bost C.-A. |
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Title |
To breathe or not to breathe ? Optimal breathing, aerobic dive limit and oxygen stores in deep-diving blue-eyed shags |
Type |
Journal Article |
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2008 |
Publication |
ANIMAL BEHAVIOUR |
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Volume |
76 |
Issue |
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Pages |
565-576 |
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109 |
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0003-3472 |
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yes |
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5692 |
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Cook, T.R.; Lescroël, A.; Tremblay, Y.; Bost, C.A. |
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To breathe or not to breathe ? Optimal breathing, aerobic dive limit and oxygen stores in deep diving blue-eyed shags. |
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Journal Article |
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2008 |
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Animal behaviour |
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76 |
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565-576 |
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394 |
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0003-3472 |
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yes |
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4948 |
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Garcia S. & Dhont D. |
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TITLE Structural analysis of the Húsavík-Flatey Transform Fault and its relationships with the rift system in Northern Iceland |
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Journal Article |
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Year |
2005 |
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Geodinamica acta |
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Volume |
18 |
Issue |
1 |
Pages |
31-41 |
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Iceland; Húsavík-Flatey Fault; Theistareykir fissure swarm; Transform-rift junction: Remote sensing |
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Abstract |
The Húsavík-Flatey Fault (HFF), partially exposed on land in the Tjörnes Peninsula, is a major dextral transform fault of the Tjörnes Fracture Zone which accommodates the movement between the North Volcanic Zone of Iceland and the Kolbeinsey Ridge. We present a revisited structural pattern of the HFF in this area, based on the mapping of tectonic features using satellite images, aerial photography, and field structural analysis. We show that the HFF comprises several WNW-trending fault segments that localise both strike-slip and normal movements, agreeing with a transtensional deformation pattern. Two different types of transform-rift connections were recognised: (1) the progressive bending of a WNW-ESE transform fault segment that merges into a N-S rift structure and further north (2) a typical triple junction between another WNW-trending transform fault segment and a N-S normal fault of the rift. Furthermore, two immature WNW-ESE-trending faults, with poorly expressed fault traces, have been observed in the northern part of the HFF. These observations are consistent with the successive formation of transform fault segments from south to north due to the northward development of the HFF together with the rift structures. |
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316 |
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0985-3111 |
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yes |
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3052 |
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