在HIP65426周围发现一颗温暖的尘埃巨行星
地球与行星天体物理
2017-12-13 v2
摘要
SHINE计划是一项针对600颗年轻邻近恒星的大型高对比度近红外巡天。其旨在利用VLT/SPHERE前所未有的高对比度和高角分辨率成像能力搜寻并表征新行星系统。它还试图对大轨道巨行星族群的出现率和轨道性质施加统计约束，作为宿主恒星质量和年龄的函数，以检验行星形成理论。我们使用SPHERE的IRDIS双波段成像仪和IFS积分视场光谱仪获取年轻A2星HIP65426的高对比度日冕仪差分近红外图像和光谱。该星是约17 Myr古老的Lower Centaurus-Crux星协的成员。在距恒星830 mas（投影92 au）处，我们探测到一个暗弱红色伴星。多历元观测确认它与HIP65426具有共同自行。利用IFS和IRDIS在0.95至2.2um间提取的谱测光测量表明其具有年轻低表面重力L5-L7矮星特征的温暖尘埃大气。热启动演化模型预言的光度与一颗6-12 MJup、Teff=1300-1600 K且R=1.5 RJup的巨行星一致。最后，与Exo-REM和PHOENIX BT-Settl合成大气模型的比较给出了一致的有效温度，但表面重力解略高，为log(g)=4.0-5.0，半径更小（1.0-1.3 RJup）。鉴于其物理和光谱性质，HIP65426b在目前已知成像行星中按年龄、质量和光谱型占据相当独特的地位。它代表了一个特别有趣的案例，可用于研究云作为大气中粒子大小、成分和位置的函数存在的情况，寻找非平衡化学的印记，并最终检验行星形成与演化理论。
引用
@article{arxiv.1707.01413,
title = {Discovery of a warm, dusty giant planet around HIP65426},
author = {G. Chauvin and S. Desidera and A. -M. Lagrange and A. Vigan and R. Gratton and M. Langlois and M. Bonnefoy and J. -L. Beuzit and M. Feldt and D. Mouillet and M. Meyer and A. Cheetham and B. Biller and A. Boccaletti and V. D'Orazi and R. Galicher and J. Hagelberg and A. -L. Maire and D. Mesa and J. Olofsson and M. Samland and T. O. B. Schmidt and E. Sissa and M. Bonavita and B. Charnay and M. Cudel and S. Daemgen and P. Delorme and P. Janin-Potiron and M. Janson and M. Keppler and H. Le Coroller and R. Ligi and G. D. Marleau and S. Messina and P. Molliere and C. Mordasini and A. Muller and S. Peretti and C. Perrot and L. Rodet and D. Rouan and A. Zurlo and C. Dominik and T. Henning and F. Menard and H. -M. Schmid and M. Turatto and S. Udry and F. Vakili and L. Abe and J. Antichi and A. Baruffolo and P. Baudoz and J. Baudrand and P. Blanchard and A. Bazzon and T. Buey and M. Carbillet and M. Carle and J. Charton and E. Cascone and R. Claudi and A. Costille and A. Deboulbe and V. De Caprio and K. Dohlen and D. Fantinel and P. Feautrier and T. Fusco and P. Gigan and E. Giro and D. Gisler and L. Gluck and N. Hubin and E. Hugot and M. Jaquet and M. Kasper and F. Madec and Y. Magnard and P. Martinez and D. Maurel and D. Le Mignant and O. Moller-Nilsson and M. Llored and T. Moulin and A. Origné and A. Pavlov and D. Perret and C. Petit and J. Pragt and P. Puget and P. Rabou and J. Ramos and R. Rigal and S. Rochat and R. Roelfsema and G. Rousset and A. Roux and B. Salasnich and J. -F. Sauvage and A. Sevin and C. Soenke and E. Stadler and M. Suarez and L. Weber and F. Wildi and S. Antoniucci and J. -C. Augereau and J. -L. Baudino and W. Brandner and N. Engler and J. Girard and C. Gry and Q. Kral and T. Kopytova and E. Lagadec and J. Milli and C. Moutou and J. Schlieder and J. Szulágyi and C. Thalmann and Z. Wahhaj},
journal= {arXiv preprint arXiv:1707.01413},
year = {2017}
}
备注
10 pages, 8 figures, 4 tables, accepted for publication in A&A, file updated