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Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS – TOI-615b, TOI-622b, and TOI-2641b |
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2023 |
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Astronomy & Astrophysics |
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675 |
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A39 |
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While the sample of confirmed exoplanets continues to grow, the population of transiting exoplanets around early-type stars is still limited. These planets allow us to investigate the planet properties and formation pathways over a wide range of stellar masses and study the impact of high irradiation on hot Jupiters orbiting such stars. We report the discovery of TOI-615b, TOI-622b, and TOI-2641b, three Saturn-mass planets transiting main sequence, F-type stars. The planets were identified by the Transiting Exoplanet Survey Satellite (TESS) and confirmed with complementary ground-based and radial velocity observations. TOI-615b is a highly irradiated (~1277 F?) and bloated Saturn-mass planet (1.69?0.06+0.05 RJup and 0.43?0.08+0.09 MJup) in a 4.66 day orbit transiting a 6850 K star. TOI-622b has a radius of 0.82?0.03+0.03 RJup and a mass of 0.30?0.08+0.07 MJup in a 6.40 day orbit. Despite its high insolation flux (~600 F?), TOI-622b does not show any evidence of radius inflation. TOI-2641b is a 0.39?0.04+0.02 MJup planet in a 4.88 day orbit with a grazing transit (b = 1.04?0.06+0.05) that results in a poorly constrained radius of 1.61?0.64+0.46 RJup. Additionally, TOI-615b is considered attractive for atmospheric studies via transmission spectroscopy with ground-based spectrographs and JWST. Future atmospheric and spin-orbit alignment observations are essential since they can provide information on the atmospheric composition, formation, and migration of exoplanets across various stellar types. |
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0004-6361, 1432-0746 |
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yes |
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8645 |
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Matrajt G., Maurette M., Duprat J., Engrand C. & Gounelle M. |
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Three new tests to validate EMMA and confirm the cometary origin of Antarctic micrometeorites. |
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2001 |
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Lunar and planetary science |
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XXXII |
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1540 |
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1065 |
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Bachelor's thesis |
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1540-7845 |
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yes |
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2769 |
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Three Long-period Transiting Giant Planets from TESS* |
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2023 |
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The Astronomical Journal |
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165 |
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6 |
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227 |
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1066 |
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1538-3881 |
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8644 |
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Chuvochina M, Alekhina I, Normand P, Petit J, Bulat S, |
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Three events of Saharan dust deposition on the Mont Blanc glacier associated with different snow-colonizing bacterial phylotypes
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2011 |
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Microbiology |
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80 |
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1 |
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125-131 |
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Biomedical and Life Sciences, |
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A preliminary study has demonstrated that the structure and species composition of microbial communities associated with events of dust deposition from the Sahara Desert to the Mont Blanc glacier varied considerably between samples originating from different time periods. Even for depositions within a single month, the dominant microbial phylotypes and candidates to colonize the snow pack were different. It is therefore highly probable that the structure and species composition of microbial communities will be different between any events of the kind. Apparently, the phenomenon does not correlate with the time the dust stays in the snow cover and consequently with the probable development of microorganisms in situ (three months, one month, and one week). The reasons for the variation may be the differences in conditions in the epicenter of a specific North African dust storm, as well as the history of the dust transport in the atmosphere. The candidates for joining the snow biome of Mont Blanc turned out to be different for three dust events (DEs) and belong to different, mostly minor, phylotypes related to Crossiella cryophilus ( Actinobacteria ), Devosia limi (- Proteobacteria ), Deinococcus claudionis Deinococcus-Thermus ), Anabaena sp. ( Cyanobacteria ), and Hymenobacter soli ( Bacteroidetes ). Since all these phylotypes have been previously isolated from soil samples of the Antarctic and Arctic, Arctic snow and ice, and the Alpine belt soils and sedimentary rocks of the glacier bed, they were tentatively ascribed to the group of snow pack colonizers. |
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355 |
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MAIK Nauka/Interperiodica distributed exclusively by Springer Science+Business Media LLC. |
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0026-2617 |
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3466 |
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M. Delmotte, J-L. Bonne, J.V. Lavric, A.C. Manning, W. Brand, M. Schmidt and V. Kazan. |
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Three and a half years of atmospheric CO2 and O2 data from Ivittuut, Southern Greenland |
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Conference - International - Poster |
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2011 |
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16th WMO/IAEA Meeting on Carbon Dioxide, Other Greenhouse gases, and Related Measurement techniques (GGMT-2011), Wellington, New-Zealand |
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439 |
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3433 |
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Three and a half years of atmospheric CO2 and O2 data from Ivittuut, Southern Greenland
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2011 |
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439 |
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yes |
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1161 |
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Conference - National - Poster |
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2018 |
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119 |
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Bachelor's thesis |
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7379 |
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Viblanc VA, Marty M, Périé C, Saraux C, Kauffmann M, Groscolas R, Célérier A |
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Threatened life: stress responses to real-time predator encounters in king penguin chicks. 9th International Penguin Congress Cape Town (South Africa) |
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2016 |
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6883 |
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Moe B., Hanssen S.A., Ytrehus B., Balk L., Chastel O., Christensen-Dalsgaard S., Gustavsson H., Langset M. |
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Title |
Thiamine deficiency and seabirds in Norway. A pilot study |
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2020 |
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Norvegian institute for nature research report |
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1720 |
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Moe, B., Hanssen, S. A., Ytrehus, B., Balk, L., Chastel, O., Christensen-Dalsgaard, S., Gustavsson, H. & Langset, M. 2020.Thiamine deficiency and seabirds in Norway. A pilot study. NINA Report 1720. Norwegian Institute for Nature Research. Thiamine (vitamin B1) is vital for life-sustaining enzymes in cells. Previous studies have reported episodes of thiamine deficiency in marine ecosystems, and suggested that this have contributed to population declines of seabirds breeding in the Baltic Sea and elsewhere. Many Norwegian seabird populations have shown a strong decline in population size, but thiamine status has never been assessed. The objective of this pilot study was, thus, to document thiamin levels in selected species and their associated food webs, and explore methodological issues relevant for future studies or monitoring. The methodological tests showed that storage freezing temperature did not affect thiamine levels in egg yolk samples, and that thiamine levels in eggs could not be corrected for incubation time. Furthermore, the quantified thiamine levels differed between two laboratories, and we developed a predictive equation to convert thiamine levels in egg yolk samples between the laboratories. This pilot study has, for the first time, investigated thiamine levels in seabird eggs from selected species and populations in Norway mainland and Svalbard, and in their food webs. We revealed variation among species, populations and prey types. The lowest levels were found in eggs from common eiders and in blue mussel which is their prey. Eggs from herring gulls had also relatively low levels. The levels for common eiders and herring gulls were higher than previously reported from the Baltic Sea. Nevertheless, the levels from common eiders, herring gulls and blue mussels should be classified as thiamine deficient according to effect-ranges reported in these previous studies. The highest levels were found in eggs from kittiwakes and Atlantic puffins. The diet samples from kittiwakes and Atlantic puffins had higher thiamine levels compared to blue mussels. This is the first time thiamine levels are reported for kittiwakes and Atlantic puffins. This pilot-study cannot answer whether Norwegian seabird population sizes are affected by thiamine levels, but we cannot rule out that thiamine can be a limiting factor for some Norwegian seabird populations. This report identifies knowledge gaps and provides recommendations for future studies and monitoring. We suggest more sampling of levels to better understand variation among years, areas, species and populations, and also clinical examinations and surveys. Studies investigating potential effects on reproduction and survival is ultimately need to better understand potential effects on population dynamics. |
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978-82-426-3471-9 |
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8727 |
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Handrich Y., Schmidt, A., Fahlman A., Gendner J.-P., Bost C.-A., Woakes, T.A. & P.J. Butler (2005). |
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Thermoregulation in the diving king penguin. A complex feature: what is known and what is unexplained. |
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Conference - International - Communication |
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2005 |
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2nd International Bio-logging Science Symposium. St Andrews, Scotland, 13-16 juin 2005. |
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394 |
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5149 |
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