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Title |
ExoClock Project. III. 450 New Exoplanet Ephemerides from Ground and Space Observations |
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Year  |
2023 |
Publication |
The Astrophysical Journal Supplement Series |
Abbreviated Journal |
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Volume |
265 |
Issue |
1 |
Pages |
4 |
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Abstract |
The ExoClock project has been created to increase the efficiency of the Ariel mission. It will achieve this by continuously monitoring and updating the ephemerides of Ariel candidates, in order to produce a consistent catalog of reliable and precise ephemerides. This work presents a homogenous catalog of updated ephemerides for 450 planets, generated by the integration of ?18,000 data points from multiple sources. These sources include observations from ground-based telescopes (the ExoClock network and the Exoplanet Transit Database), midtime values from the literature, and light curves from space telescopes (Kepler, K2, and TESS). With all the above, we manage to collect observations for half of the postdiscovery years (median), with data that have a median uncertainty less than 1 minute. In comparison with the literature, the ephemerides generated by the project are more precise and less biased. More than 40% of the initial literature ephemerides had to be updated to reach the goals of the project, as they were either of low precision or drifting. Moreover, the integrated approach of the project enables both the monitoring of the majority of the Ariel candidates (95%), and also the identification of missing data. These results highlight the need for continuous monitoring to increase the observing coverage of the candidate planets. Finally, the extended observing coverage of planets allows us to detect trends (transit-timing variations) for a sample of 19 planets. All the products, data, and codes used in this work are open and accessible to the wider scientific community. |
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0067-0049 |
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yes |
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8684 |
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Year |
2023 |
Publication |
Ecology and Evolution |
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Volume |
13 |
Issue |
12 |
Pages |
e10796 |
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1182 |
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2045-7758 |
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yes |
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Serial |
8745 |
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Author |
Alexander A. Kokhanovsky, Maximillian Brell, Karl Segl, Giovanni Bianchini, Christian Lanconelli, Angelo Lupi, Boyan Petkov, Ghislain Picard, Laurent Arnaud, Robert S. Stone, Sabine Chabrillat |
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Title |
First Retrievals of Surface and Atmospheric Properties Using EnMAP Measurements over Antarctica |
Type |
Journal |
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Year |
2023 |
Publication |
Remote Sensing |
Abbreviated Journal |
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Volume |
15 |
Issue |
12 |
Pages |
3042 |
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Keywords |
ice grain size light scattering radiative transfer snow albedo snow remote sensing |
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Abstract |
The paper presents the first retrievals of clean snow properties using spaceborne hyperspectral observations via the Environmental Mapping and Analysis Program (EnMAP). The location close to the Concordia station at the Dome C Plateau (Antarctica) was selected. At this location, the atmospheric effects (except molecular light scattering and absorption) are weak, and the simplified atmospheric correction scheme could be applied. The ice grain size, snow specific surface area, and snow spectral and broadband albedos were retrieved using single-view EnMAP measurements. In addition, we propose a technique to retrieve trace gas concentrations (e.g., water vapor and ozone) from EnMAP observations over the snow surfaces. A close correspondence of satellite and ground-measured parameters was found. |
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1110 |
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2072-4292 |
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yes |
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8548 |
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Title |
TOI-4562b: A Highly Eccentric Temperate Jupiter Analog Orbiting a Young Field Star |
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Year |
2023 |
Publication |
The Astronomical Journal |
Abbreviated Journal |
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Volume |
165 |
Issue |
3 |
Pages |
121 |
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1066 |
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ISSN |
1538-3881 |
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yes |
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8647 |
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Author |
Alison F. Banwell, Nander Wever, Devon Dunmire, Ghislain Picard |
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Title |
Quantifying Antarctic-Wide Ice-Shelf Surface Melt Volume Using Microwave and Firn Model Data: 1980 to 2021 |
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Journal |
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Year |
2023 |
Publication |
Geophysical Research Letters |
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Volume |
50 |
Issue |
12 |
Pages |
e2023GL102744 |
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1110 |
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ISSN |
1944-8007 |
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yes |
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Serial |
8637 |
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Title |
Complete Genome Sequences of Two Pasteurella multocida Isolates from Seabirds |
Type |
Journal |
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Year |
2023 |
Publication |
Microbiology Resource Announcements |
Abbreviated Journal |
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Volume |
12 |
Issue |
4 |
Pages |
e01365-22 |
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Abstract |
Pasteurella multocida is one of the major causes of mass mortalities in wild birds. Here, we report the complete genome sequences of two P. multocida isolates from wild populations of two endangered seabird species, the Indian yellow-nosed albatrosses (Thalassarche carteri) and the northern rockhopper penguins (Eudyptes moseleyi). |
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1151 |
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2576-098X |
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yes |
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8623 |
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Title |
Mercury Contamination Challenges the Behavioral Response of a Keystone Species to Arctic Climate Change |
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Journal |
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Year |
2023 |
Publication |
Environmental Science & Technology |
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Volume |
57 |
Issue |
5 |
Pages |
2054-2063 |
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Abstract |
Combined effects of multiple, climate change-associated stressors are of mounting concern, especially in Arctic ecosystems. Elevated mercury (Hg) exposure in Arctic animals could affect behavioral responses to changes in foraging landscapes caused by climate change, generating interactive effects on behavior and population resilience. We investigated this hypothesis in little auks (Alle alle), a keystone Arctic seabird. We compiled behavioral data for 44 birds across 5 years using accelerometers while also quantifying blood Hg and environmental conditions. Warm sea surface temperature (SST) and low sea ice coverage reshaped time activity budgets (TABs) and diving patterns, causing decreased resting, increased flight, and longer dives. Mercury contamination was not associated with TABs. However, highly contaminated birds lengthened interdive breaks when making long dives, suggesting Hg-induced physiological limitations. As dive durations increased with warm SST, subtle toxicological effects threaten to increasingly constrain diving and foraging efficiency as climate change progresses, with ecosystem-wide repercussions. |
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388 |
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ISSN |
0013-936X |
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Approved |
yes |
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Serial |
8632 |
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Title |
Contaminant-by-environment interactive effects on animal behavior in the context of global change: Evidence from avian behavioral ecotoxicology |
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Year |
2023 |
Publication |
Science of The Total Environment |
Abbreviated Journal |
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Volume |
879 |
Issue |
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Pages |
163169 |
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Keywords |
Behavioral ecotoxicology Behavioral plasticity Behavioral reaction norms Chemical contaminants Interactive effects Multiple stressors |
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Abstract |
The potential for chemical contaminant exposure to interact with other stressors to affect animal behavioral responses to environmental variability is of mounting concern in the context of anthropogenic environmental change. We systematically reviewed the avian literature to evaluate evidence for contaminant-by-environment interactive effects on animal behavior, as birds are prominent models in behavioral ecotoxicology and global change research. We found that only 17 of 156 (10.9 %) avian behavioral ecotoxicological studies have explored contaminant-by-environment interactions. However, 13 (76.5 %) have found evidence for interactive effects, suggesting that contaminant-by-environment interactive effects on behavior are understudied but important. We draw on our review to develop a conceptual framework to understand such interactive effects from a behavioral reaction norm perspective. Our framework highlights four patterns in reaction norm shapes that can underlie contaminant-by-environment interactive effects on behavior, termed exacerbation, inhibition, mitigation and convergence. First, contamination can render individuals unable to maintain critical behaviors across gradients in additional stressors, exacerbating behavioral change (reaction norms steeper) and generating synergy. Second, contamination can inhibit behavioral adjustment to other stressors, antagonizing behavioral plasticity (reaction norms shallower). Third, a second stressor can mitigate (antagonize) toxicological effects of contamination, causing steeper reaction norms in highly contaminated individuals, with improvement of performance upon exposure to additional stress. Fourth, contamination can limit behavioral plasticity in response to permissive conditions, such that performance of more and less contaminated individuals converges under more stressful conditions. Diverse mechanisms might underlie such shape differences in reaction norms, including combined effects of contaminants and other stressors on endocrinology, energy balance, sensory systems, and physiological and cognitive limits. To encourage more research, we outline how the types of contaminant-by-environment interactive effects proposed in our framework might operate across multiple behavioral domains. We conclude by leveraging our review and framework to suggest priorities for future research. |
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0048-9697 |
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yes |
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Call Number |
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Serial |
8625 |
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Year |
2023 |
Publication |
Journal of Heredity |
Abbreviated Journal |
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Volume |
114 |
Issue |
2 |
Pages |
94-109 |
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Abstract |
Genome sequences can reveal the extent of inbreeding in small populations. Here, we present the first genomic characterization of type D killer whales, a distinctive eco/morphotype with a circumpolar, subantarctic distribution. Effective population size is the lowest estimated from any killer whale genome and indicates a severe population bottleneck. Consequently, type D genomes show among the highest level of inbreeding reported for any mammalian species (FROH ? 0.65). Detected recombination cross-over events of different haplotypes are up to an order of magnitude rarer than in other killer whale genomes studied to date. Comparison of genomic data from a museum specimen of a type D killer whale that stranded in New Zealand in 1955, with 3 modern genomes from the Cape Horn area, reveals high covariance and identity-by-state of alleles, suggesting these genomic characteristics and demographic history are shared among geographically dispersed social groups within this morphotype. Limitations to the insights gained in this study stem from the nonindependence of the 3 closely related modern genomes, the recent coalescence time of most variation within the genomes, and the nonequilibrium population history which violates the assumptions of many model-based methods. Long-range linkage disequilibrium and extensive runs of homozygosity found in type D genomes provide the potential basis for both the distinctive morphology, and the coupling of genetic barriers to gene flow with other killer whale populations. |
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109 |
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1465-7333 |
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yes |
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8557 |
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Title |
Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS – TOI-615b, TOI-622b, and TOI-2641b |
Type |
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Year |
2023 |
Publication |
Astronomy & Astrophysics |
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Volume |
675 |
Issue |
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Pages |
A39 |
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Abstract |
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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