K2-66b and K2-106b: Two Extremely Hot Sub-Neptune-size Planets with High Densities
K2-66b and K2-106b: Two Extremely Hot Sub-Neptune-size Planets with High Densities
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K2-66b 和 K2-106b：两颗极热的高密度亚海王星大小行星
DOI：
10.3847/1538-3881/aa725f
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
S. Lépine
中科院分区：
文献类型：
--
作者：
E. Sinukoff;A. Howard;E. Petigura;B. Fulton;I. Crossfield;H. Isaacson;E. Gonzales;J. Crepp;J. Brewer;L. Hirsch;L. Weiss;D. Ciardi;J. Schlieder;B. Benneke;J. Christiansen;C. Dressing;B. Hansen;H. Knutson;M. Kosiarek;J. Livingston;T. Greene;L. Rogers;S. Lépine
我们报告了K2任务中使用径向速度，K2光度测定和自适应光学成像对两颗极热的亚海王星大小行星的精确质量和密度测量。K2-66拥有一颗接近海王星大小的行星（K2-66b），质量为。由于这颗恒星正在向亚巨星分支演化，K2-66b受到了高水平的辐射，大约是主序星的两倍。K2-66b可能位于所谓的“光蒸发沙漠”中，这是一个行星大小和入射通量几乎完全没有行星的区域。它的质量和半径表明，K2-66b最多只有很小的包络层（<5%），甚至根本没有包络层，这使它成为没有包络层的最大行星之一。K2-106拥有一颗超短周期行星（P = 13.7小时），这是迄今为止发现的温度最高的次海王星大小的行星之一。它的半径（）和质量（）与岩石组成一致，就像所有其他具有良好测量质量的小型超短周期行星一样。K2-106还拥有一颗更大、周期更长的行星（P = 13.3天），其质量小于99.7%的置信度。K2-66b和K2-106b探测极端辐射环境下的行星物理。它们的高密度反映了在如此极端的环境中保持大量气体包层的挑战。
We report precise mass and density measurements of two extremely hot sub-Neptune-size planets from the K2 mission using radial velocities, K2 photometry, and adaptive optics imaging. K2-66 harbors a close-in sub-Neptune-sized ( ) planet (K2-66b) with a mass of . Because the star is evolving up the subgiant branch, K2-66b receives a high level of irradiation, roughly twice the main-sequence value. K2-66b may reside within the so-called “photoevaporation desert,” a domain of planet size and incident flux that is almost completely devoid of planets. Its mass and radius imply that K2-66b has, at most, a meager envelope fraction (<5%) and perhaps no envelope at all, making it one of the largest planets without a significant envelope. K2-106 hosts an ultra-short-period planet (P = 13.7 hr) that is one of the hottest sub-Neptune-size planets discovered to date. Its radius ( ) and mass ( ) are consistent with a rocky composition, as are all other small ultra-short-period planets with well-measured masses. K2-106 also hosts a larger, longer-period planet ( = , P = 13.3 days) with a mass less than at 99.7% confidence. K2-66b and K2-106b probe planetary physics in extreme radiation environments. Their high densities reflect the challenge of retaining a substantial gas envelope in such extreme environments.
DOI：
10.1088/0004-637x/800/2/135
发表时间：
2014-12
期刊：
The Astrophysical Journal
影响因子：
--
作者：
C. Dressing;D. Charbonneau;X. Dumusque;S. Gettel;F. Pepe;A. Collier Cameron;D. Latham;E. Molinari;S. Udry;L. Affer;A. Bonomo;L. Buchhave;R. Cosentino;P. Figueira;A. Fiorenzano;A. Harutyunyan;R. Haywood;J. Johnson;M. López-Morales;C. Lovis;L. Malavolta;M. Mayor;G. Micela;F. Motalebi;V. Nascimbeni;D. Phillips;G. Piotto;D. Pollacco;D. Queloz;K. Rice;D. Sasselov;D. Ségransan;A. Sozzetti;A. Szentgyorgyi;C. Watson
通讯作者：
C. Dressing;D. Charbonneau;X. Dumusque;S. Gettel;F. Pepe;A. Collier Cameron;D. Latham;E. Molinari;S. Udry;L. Affer;A. Bonomo;L. Buchhave;R. Cosentino;P. Figueira;A. Fiorenzano;A. Harutyunyan;R. Haywood;J. Johnson;M. López-Morales;C. Lovis;L. Malavolta;M. Mayor;G. Micela;F. Motalebi;V. Nascimbeni;D. Phillips;G. Piotto;D. Pollacco;D. Queloz;K. Rice;D. Sasselov;D. Ségransan;A. Sozzetti;A. Szentgyorgyi;C. Watson