干旱区生态环境知识资源中心(Arid): Spitzer Reveals Evidence of Molecular Absorption in the Atmosphere of the Hot Neptune LTT 9779b

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DOI	10.3847/2041-8213/abbc70
	Spitzer Reveals Evidence of Molecular Absorption in the Atmosphere of the Hot Neptune LTT 9779b
	Dragomir, Diana; Crossfield, Ian J. M.; Benneke, Bjoern; Wong, Ian; Daylan, Tansu; Diaz, Matias; Deming, Drake; Molliere, Paul; Kreidberg, Laura; Jenkins, James S.; Berardo, David; Christiansen, Jessie L.; Dressing, Courtney D.; Gorjian, Varoujan; Kane, Stephen R.; Mikal-Evans, Thomas; Morales, Farisa Y.; Werner, Michael; Ricker, George R.; Vanderspek, Roland; Seager, S.; Winn, Joshua N.; Jenkins, Jon M.; Colon, Knicole D.; Fong, Willie; Guerrero, Natalia; Hesse, Katharine; Osborn, Hugh P.; Rose, Mark E.; Smith, Jeffrey C.; Ting, Eric B.
通讯作者	Dragomir, D
来源期刊	ASTROPHYSICAL JOURNAL LETTERS
ISSN	2041-8205
EISSN	2041-8213
出版年	2020
卷号	903 期号:1
英文摘要	Non-rocky sub-Jovian exoplanets in high-irradiation environments are rare. LTT 9779b, also known as Transiting Exoplanet Survey Satellite (TESS) object of interest (TOI) 193.01, is one of the few such planets discovered to date, and the first example of an ultrahot Neptune. The planet's bulk density indicates that it has a substantial atmosphere, so to investigate its atmospheric composition and shed further light on its origin, we obtained Spitzer InfraRed Array Camera secondary eclipse observations of LTT 9779b at 3.6 and 4.5 mu m. We combined the Spitzer observations with a measurement of the secondary eclipse in the TESS bandpass. The resulting secondary eclipse spectrum strongly prefers a model that includes CO absorption over a blackbody spectrum, incidentally making LTT 9779b the first TESS exoplanet (and the first ultrahot Neptune) with evidence of a spectral feature in its atmosphere. We did not find evidence of a thermal inversion, at odds with expectations based on the atmospheres of similarly irradiated hot Jupiters. We also report a nominal dayside brightness temperature of 2305 141 K (based on the 3.6 mu m secondary eclipse measurement), and we constrained the planet's orbital eccentricity to e < 0.01 at the 99.7% confidence level. Together with our analysis of LTT 9779b's thermal phase curves reported in a companion paper, our results set the stage for similar investigations of a larger sample of exoplanets discovered in the hot-Neptune desert, investigations that are key to uncovering the origin of this population.
英文关键词	Sky surveys Eclipses Exoplanets Hot Neptunes Infrared astronomy Exoplanet atmospheres
类型	Article
语种	英语
开放获取类型	Green Published, Green Submitted
收录类别	SCI-E
WOS记录号	WOS:000584373100001
WOS关键词	EXOPLANET ; EFFICIENT ; ARRAY
WOS类目	Astronomy & Astrophysics
WOS研究方向	Astronomy & Astrophysics
来源机构	University of California, Berkeley
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/327232
作者单位	[Dragomir, Diana] Univ New Mexico, Dept Phys & Astron, 1919 Lomas Blvd NE, Albuquerque, NM 87131 USA; [Crossfield, Ian J. M.] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA; [Benneke, Bjoern] Univ Montreal, Inst Res Exoplanets, Montreal, PQ H3T 1J4, Canada; [Wong, Ian; Seager, S.] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA; [Daylan, Tansu; Berardo, David; Mikal-Evans, Thomas; Ricker, George R.; Vanderspek, Roland; Seager, S.; Fong, Willie; Guerrero, Natalia; Osborn, Hugh P.] MIT, Dept Phys, Cambridge, MA 02139 USA; [Daylan, Tansu; Berardo, David; Mikal-Evans, Thomas; Ricker, George R.; Vanderspek, Roland; Seager, S.; Fong, Willie; Guerrero, Natalia; Osborn, Hugh P.] MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA; [Diaz, Matias] Univ Chile, Dept Astron, Camino El Observatorio 1515, Santiago, Chile; [Deming, Drake] Univ Maryland, Dept Astron, College Pk, MD 20742 USA; [Molliere, Paul; Kreidberg, Laura] Max Planck Inst Astron, Konigstuhl ...
推荐引用方式 GB/T 7714	Dragomir, Diana,Crossfield, Ian J. M.,Benneke, Bjoern,et al. Spitzer Reveals Evidence of Molecular Absorption in the Atmosphere of the Hot Neptune LTT 9779b[J]. University of California, Berkeley,2020,903(1).
APA	Dragomir, Diana.,Crossfield, Ian J. M..,Benneke, Bjoern.,Wong, Ian.,Daylan, Tansu.,...&Ting, Eric B..(2020).Spitzer Reveals Evidence of Molecular Absorption in the Atmosphere of the Hot Neptune LTT 9779b.ASTROPHYSICAL JOURNAL LETTERS,903(1).
MLA	Dragomir, Diana,et al."Spitzer Reveals Evidence of Molecular Absorption in the Atmosphere of the Hot Neptune LTT 9779b".ASTROPHYSICAL JOURNAL LETTERS 903.1(2020).