Discovery of a warm, dusty giant planet around HIP65426
G. Chauvin, S. Desidera, A. -M. Lagrange, A. Vigan, R. Gratton, M. Langlois, M. Bonnefoy, J. -L. Beuzit, M. Feldt, D. Mouillet, M. Meyer, A. Cheetham, B. Biller… 展开作者
G. Chauvin, S. Desidera, A. -M. Lagrange, A. Vigan, R. Gratton, M. Langlois, M. Bonnefoy, J. -L. Beuzit, M. Feldt, D. Mouillet, M. Meyer, A. Cheetham, B. Biller, A. Boccaletti, V. D'Orazi, R. Galicher, J. Hagelberg, A. -L. Maire, D. Mesa, J. Olofsson, M. Samland, T. O. B. Schmidt, E. Sissa, M. Bonavita, B. Charnay, M. Cudel, S. Daemgen, P. Delorme, P. Janin-Potiron, M. Janson, M. Keppler, H. Le Coroller, R. Ligi, G. D. Marleau, S. Messina, P. Molliere, C. Mordasini, A. Muller, S. Peretti, C. Perrot, L. Rodet, D. Rouan, A. Zurlo, C. Dominik, T. Henning, F. Menard, H. -M. Schmid, M. Turatto, S. Udry, F. Vakili, L. Abe, J. Antichi, A. Baruffolo, P. Baudoz, J. Baudrand, P. Blanchard, A. Bazzon, T. Buey, M. Carbillet, M. Carle, J. Charton, E. Cascone, R. Claudi, A. Costille, A. Deboulbe, V. De Caprio, K. Dohlen, D. Fantinel, P. Feautrier, T. Fusco, P. Gigan, E. Giro, D. Gisler, L. Gluck, N. Hubin, E. Hugot, M. Jaquet, M. Kasper, F. Madec, Y. Magnard, P. Martinez, D. Maurel, D. Le Mignant, O. Moller-Nilsson, M. Llored, T. Moulin, A. Origné, A. Pavlov, D. Perret, C. Petit, J. Pragt, P. Puget, P. Rabou, J. Ramos, R. Rigal, S. Rochat, R. Roelfsema, G. Rousset, A. Roux, B. Salasnich, J. -F. Sauvage, A. Sevin, C. Soenke, E. Stadler, M. Suarez, L. Weber, F. Wildi, S. Antoniucci, J. -C. Augereau, J. -L. Baudino, W. Brandner, N. Engler, J. Girard, C. Gry, Q. Kral, T. Kopytova, E. Lagadec, J. Milli, C. Moutou, J. Schlieder, J. Szulágyi, C. Thalmann, Z. Wahhaj
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10 pages, 8 figures, 4 tables, accepted for publication in A&A, file updated
The SHINE program is a large high-contrast near-infrared survey of 600 young, nearby stars. It is aimed at searching for and characterizing new planetary systems using VLT/SPHERE's unprecedented high-contrast and high-angular resolution imaging capabilities. It also intends at placing statistical constraints on the occurrence and orbital properties of the giant planet population at large orbits as a function of the stellar host mass and age to test planet formation theories. We use the IRDIS dual-band imager and the IFS integral field spectrograph of SPHERE to acquire high-constrast coronagraphic differential near-infrared images and spectra of the young A2 star HIP65426. It is a member of the ~17 Myr old Lower Centaurus-Crux association. At a separation of 830 mas (92 au projected) from the star, we detect a faint red companion. Multi-epoch observations confirm that it shares common proper motion with HIP65426. Spectro-photometric measurements extracted with IFS and IRDIS between 0.95 and 2.2um indicate a warm, dusty atmosphere characteristic of young low surface-gravity L5-L7 dwarfs. Hot-start evolutionary models predict a luminosity consistent with a 6-12 MJup, Teff=1300-1600 K and R=1.5 RJup giant planet. Finally, the comparison with Exo-REM and PHOENIX BT-Settl synthetic atmosphere models gives consistent effective temperatures but with slightly higher surface gravity solutions of log(g)=4.0-5.0 with smaller radii (1.0-1.3 RJup). Given its physical and spectral properties, HIP65426b occupies a rather unique placement in terms of age, mass and spectral-type among the currently known imaged planets. It represents a particularly interesting case to study the presence of clouds as a function of particle size, composition, and location in the atmosphere, to search for signatures of non-equilibrium chemistry, and finally to test the theory of planet formation and evolution.
Photochemical Production of CS2 in Temperate-to-Warm Gas Giant Exoplanet Atmospheres
University of Chicago（芝加哥大学）；Arizona State University（亚利桑那州立大学）；University of California, Santa Cruz（加州大学圣克鲁兹分校）；Carnegie Institution for Science（卡内基科学机构）
The GAPS Programme at TNG XXXIX -- Multiple molecular species in the atmosphere of the warm giant planet WASP-80 b unveiled at high resolution with GIANO-B
Nitrogen as a Tracer of Giant Planet Formation. I.: A Universal Deep Adiabatic Profile and Semi-analytical Predictions of Disequilibrium Ammonia Abundances in Warm Exoplanetary Atmospheres
Beyond Equilibrium Temperature: How the Atmosphere/Interior Connection Affects the Onset of Methane, Ammonia, and Clouds in Warm Transiting Giant Planets
The Identification of CS2 and Evidence for Carbon-Sulfur Chemical Coupling in a Warm Giant Exoplanet Atmosphere
University of Wisconsin–Madison（威斯康星大学麦迪逊分校）；Arizona State University（亚利桑那州立大学）；Space Telescope Science Institute（太空望远镜科学研究所）；Schmidt Sciences（施密特科学）；California Institute of Technology（加州理工学院）；University of California Santa Cruz（加州大学圣克鲁兹分校）；Université Côte d’Azur（蔚蓝海岸大学）
Tracking Advanced Planetary Systems (TAPAS) with HARPS-N. III. HD 5583 and BD+15 2375 - two cool giants with warm companions
演化恒星是理解行星形成机制对恒星质量的依赖性和深入探索恒星-行星相互作用机制的关键。在过去的十年中，我们已经监测了大约1000颗进化恒星的径向速度变化，以寻找宾夕法尼亚州立大学-托伦天文学行星搜索中心的Hobby-Eberly望远镜下的低质量同伴。根据TAPAS项目，在3.6米国家伽利略望远镜上使用HARPS-N跟踪了需要更高RV精度测量的选定潜在候选者。我们的目标是探测演化恒星周围的行星系，以便能够对这些系统的频率和内在性质进行合理的统计，并对选定的行星系进行深入研究，并提供恒星-行星相互作用过程的证据。对于HD 5583，我们使用Hobby-Eberly望远镜（HET）在2313天内收集了14个时期的精确RV测量数据，并在976天内收集了22个时期的超精确HARPS-N数据。对于BD+15 2375，我们收集了超过3286天的24个HET数据和超过902天的25个HARPS-S数据。我们报告发现了两个行星质量物体绕两颗演化的红巨星运行：HD~5583在0.529天文单位处有一个近圆轨道的伴星，它的轨道半径为5.78 M，轨道半径为$_{J}$（e=0.076），是用RV技术探测到的一颗巨星最近的伴星，BD+15~2735，它的m sin i= 1.06 M $_{J}$保持着迄今为止发现的最轻行星绕演化恒星运行的记录（在圆e=0.001，0.576 AU的轨道上）。这是TAPA…
TIC65910228b: A single-transit discovery of a massive long-period warm Jupiter with TESS
Pontificia Universidad Católica de Chile（智利天主教 Pontificia 大学）；Universidad Adolfo Ibáñez（阿道夫·伊巴涅斯大学）；Millennium Institute for Astrophysics（天体物理学千年研究所）；European Southern Observatory (ESO)（欧洲南方天文台）；Astronomical Institute of the Czech Academy of Sciences（捷克科学院天文研究所）；Astronomical Institute of Charles University（查理大学天文研究所）；Max-Planck-Institut für Astronomie（马克斯·普朗克天体物理研究所）；Space Telescope Science Institute（太空望远镜科学研究所）
The New Generation Planetary Population Synthesis (NGPPS). III. Warm super-Earths and cold Jupiters: A weak occurrence correlation, but with a strong architecture-composition link
Evidence for disequilibrium chemistry from vertical mixing in hot Jupiter atmospheres. A comprehensive survey of transiting close-in gas giant exoplanets with warm-Spitzer/IRAC
[摘要]目的。本文利用Spitzer/IRAC在3.6和4.5 μ m波段的红外透射测光技术对49颗气态巨系外行星进行了大规模的大气研究。方法.我们使用自定义管道统一分析了33个过境行星的70个光度光变曲线，该管道实现了像素级去相关。我们利用这一调查来了解红外测光如何跟踪大气化学性质的变化作为行星温度的函数。我们比较我们的测量网格的一维辐射对流平衡向前大气模型，其中包括不平衡化学。我们探索了垂直混合的各种强度（Kzz = 0 - 10^12 cm 2/s）以及两种化学成分（1x和30 x太阳）。结果我们发现，平均而言，斯皮策探测器探测3.6和4.5微米之间的0.5大气尺度高度的差异，这是在7.5西格玛的显着性水平。我们发现，与预期相比，最冷的行星显示出甲烷的缺乏，这也是以前对单个物体的研究所报道的。我们发现，最冷行星的样本排除了1x太阳成分，置信度>3sigma，同时支持低垂直混合（Kzz = 10^8 cm 2/s）。另一方面，我们发现热行星最好用1x太阳金属丰度和高垂直混合（Kzz = 10^12 cm 2/s）的模型来解释。我们解释这是由于CH 4向大气上层的漂移。改变内部温度会改变对深层平衡化学的预期，因此对不平衡化学的预期会更高。我们还发现了一个显着的分散在传输签名的中温带和超热的行星，可能是由于增加了大气的多样性，而不需要调用更高的金属丰度。此外，我们比较斯皮策传输与排…
