干旱区生态环境知识资源中心(Arid): Zodiacal exoplanets in time - X. The orbit and atmosphere of the young 'neptune desert'-dwelling planet K2-100b

Arid

DOI	10.1093/mnras/staa918
	Zodiacal exoplanets in time - X. The orbit and atmosphere of the young 'neptune desert'-dwelling planet K2-100b
	Gaidos, E.1,2,3; Hirano, T.4; Mann, A. W.5; Owens, D. A.5; Berger, T. A.6; France, K.7; Vanderburg, A.8; Harakawa, H.9,10; Hodapp, K. W.11; Ishizuka, M.12; Jacobson, S.11; Konishi, M.13; Kotani, T.10,14,15; Kudo, T.9,10; Kurokawa, T.14,16; Kuzuhara, M.10,14; Nishikawa, J.10,14; Omiya, M.10,14; Serizawa, T.16; Tamura, M.10,12,14; Ueda, A.14
通讯作者	Gaidos, E.
来源期刊	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
ISSN	0035-8711
EISSN	1365-2966
出版年	2020
卷号	495 期号:1 页码:650-662
英文摘要	We obtained high-resolution infrared spectroscopy and short-cadence photometry of the 600-800 Myr Praesepe star K2-100 during transits of its 1.67-d planet. This Neptune-size object, discovered by the NASA K2 mission, is an interloper in the 'desert' of planets with similar radii on short-period orbits. Our observations can be used to understand its origin and evolution by constraining the orbital eccentricity by transit fitting, measuring the spin-orbit obliquity by the Rossiter-McLaughlin effect, and detecting any extended, escaping the hydrogen-helium envelope with the 10 830 -angstrom line of neutral helium in the 2s(3)S triplet state. Transit photometry with 1-min cadence was obtained by the K2 satellite during Campaign 18 and transit spectra were obtained with the IRD spectrograph on the Subaru telescope. While the elevated activity of K2-100 prevented us from detecting the Rossiter-McLaughlin effect, the new photometry combined with revised stellar parameters allowed us to constrain the eccentricity to e < 0.15/0.28 with 90/99 per cent confidence. We modelled atmospheric escape as an isothermal, spherically symmetric Parker wind, with photochemistry driven by ultraviolet radiation, which we estimate by combining the observed spectrum of the active Sun with calibrations from observations of K2-100 and similar young stars in the nearby Hyades cluster. Our non-detection (<5.7 m angstrom) of a transit-associated He I line limits mass-loss of a solar-composition atmosphere through a T <= 10000 K wind to <0.3 M-circle plus Gyr(-1). Either K2-100b is an exceptional desert-dwelling planet, or its mass-loss is occurring at a lower rate over a longer interval, consistent with a core accretion-powered scenario for escape.
英文关键词	techniques: spectroscopic Sun: UV radiation planets and satellites: atmospheres planets and satellites: physical evolution stars: activity planetary systems
类型	Article
语种	英语
国家	USA ; Germany ; Japan
开放获取类型	Bronze, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000539101400053
WOS关键词	STARS ; EVOLUTION ; DYNAMICS ; HELIUM ; HYADES ; SOLAR ; RAY ; DEPENDENCE ; EMISSION ; ROTATION
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/319225
作者单位	1.Univ Hawaii Manoa, Dept Earth Sci, Honolulu, HI 96822 USA; 2.UC Santa Barbara, Kavli Inst Theoret Phys, Santa Barbara, CA 93106 USA; 3.Georg August Univ Gottingen, Inst Astrophys, D-37077 Gottingen, Germany; 4.Tokyo Inst Technol, Dept Earth & Planetary Sci, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528551, Japan; 5.Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27599 USA; 6.Univ Hawaii Manoa, Inst Astron, Honolulu, HI 96822 USA; 7.Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80309 USA; 8.Univ Texas Austin, Dept Astron, RLM 15308, Austin, TX 78712 USA; 9.Subaru Telescope, 650 N Aohoku Pl, Hilo, HI 96720 USA; 10.NINS, Astrobiol Ctr, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan; 11.Univ Hawaii, Inst Astron, 640 N Aohoku Pl, Hilo, HI 96720 USA; 12.Univ Tokyo, Grad Sch Sci, Dept Astron, Bunkyo Ku, 7-3-1 Hongo, Tokyo 1130033, Japan; 13.Oita Univ, Fac Sci & Technol, 700 Dannoharu, Oita 8701192, Japan; 14.NINS, Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan; 15.Grad Univ Adv Studies SOKENDAI, Sch Sci, Dept Astron, 2-21-1 Osawa, Mitaka, Tokyo 2400193, Japan; 16.Tokyo Univ Agr & Technol, 3-8-1 Saiwai Cho, Fuchu, Tokyo 1830054, Japan
推荐引用方式 GB/T 7714	Gaidos, E.,Hirano, T.,Mann, A. W.,et al. Zodiacal exoplanets in time - X. The orbit and atmosphere of the young 'neptune desert'-dwelling planet K2-100b[J],2020,495(1):650-662.
APA	Gaidos, E..,Hirano, T..,Mann, A. W..,Owens, D. A..,Berger, T. A..,...&Ueda, A..(2020).Zodiacal exoplanets in time - X. The orbit and atmosphere of the young 'neptune desert'-dwelling planet K2-100b.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,495(1),650-662.
MLA	Gaidos, E.,et al."Zodiacal exoplanets in time - X. The orbit and atmosphere of the young 'neptune desert'-dwelling planet K2-100b".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 495.1(2020):650-662.