干旱区生态环境知识资源中心(Arid): Phase Curves of Hot Neptune LTT 9779b Suggest a High-metallicity Atmosphere

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DOI	10.3847/2041-8213/abbc71
	Phase Curves of Hot Neptune LTT 9779b Suggest a High-metallicity Atmosphere
	Crossfield, Ian J. M.; Dragomir, Diana; Cowan, Nicolas B.; Daylan, Tansu; Wong, Ian; Kataria, Tiffany; Deming, Drake; Kreidberg, Laura; Mikal-Evans, Thomas; Gorjian, Varoujan; Jenkins, James S.; Benneke, Bjorn; Collins, Karen A.; Burke, Christopher J.; Henze, Christopher E.; McDermott, Scott; Mireles, Ismael; Watanabe, David; Wohler, Bill; Ricker, George; Vanderspek, Roland; Seager, Sara; Jenkins, Jon M.
通讯作者	Crossfield, IJM
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	Phase-curve measurements provide a global view of the composition, thermal structure, and dynamics of exoplanet atmospheres. Although most of the dozens of phase-curve measurements made to date are of large, massive hot Jupiters, there is considerable interest in probing the atmospheres of the smaller planets that are the more typical endproduct of the planet formation process. One such planet that is favorable for these studies is the ultrahot Neptune LTT 9779b, a rare denizen of the Neptune desert. A companion paper presents the planet's secondary eclipses and dayside thermal emission spectrum; in this work we describe the planet's optical and infrared phase curves, characterized using a combination of Spitzer and Transiting Exoplanet Survey Satellite (TESS) photometry. We detect LTT 9779b's thermal phase variations at 4.5 mu m, finding a phase amplitude of 358 106 ppm and no significant phase offset, with a longitude of peak emission occurring -10 degrees 21 degrees east of the substellar point. Combined with our secondary eclipse observations, these phase-curve measurements imply a 4.5 mu m dayside brightness temperature of 1800 120 K, a nightside brightness temperature of 700 430 K (<1350 K at 2 sigma confidence), and a day-night brightness temperature contrast of 1110 460 K. We compare our data to the predictions of 3D general circulation models calculated at multiple metallicity levels and to similar observations of hot Jupiters experiencing similar levels of stellar irradiation. Though not conclusive, our measurement of its small 4.5 mu m phase offset, the relatively large amplitude of the phase variation, and the qualitative differences between our target's dayside emission spectrum and those of hot Jupiters of similar temperatures all suggest a supersolar atmospheric metallicity for LTT 9779b, as might be expected given its size and mass. Finally, we measure the planet's transits at both 3.6 mu m and 4.5 mu m, providing a refined ephemeris (P = 0.79207022 0.00000069 days, T-0 = 2458783.51636 0.00027, BJD(TDB)) that will enable efficient scheduling of future observations to further characterize the atmosphere of this intriguing planet.
英文关键词	Exoplanet atmospheres
类型	Article
语种	英语
开放获取类型	Green Submitted, Green Published
收录类别	SCI-E
WOS记录号	WOS:000582566400001
WOS关键词	ERROR-CORRECTION ; MASS EXOPLANET ; CIRCULATION ; OFFSET
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/2XILL650/327136
作者单位	[Crossfield, Ian J. M.] Univ Kansas, Dept Phys & Astron, Lawrence, KS 66045 USA; [Dragomir, Diana] Univ New Mexico, Dept Phys & Astron, Albuquerque, NM 87131 USA; [Cowan, Nicolas B.] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada; [Cowan, Nicolas B.] McGill Univ, Dept Earth & Planetary Sci, Montreal, PQ H3A 2T8, Canada; [Daylan, Tansu; Mikal-Evans, Thomas; Burke, Christopher J.; Mireles, Ismael; Ricker, George; Vanderspek, Roland; Seager, Sara] MIT, Dept Phys, Cambridge, MA 02139 USA; [Daylan, Tansu; Mikal-Evans, Thomas; Burke, Christopher J.; Mireles, Ismael; Ricker, George; Vanderspek, Roland; Seager, Sara] MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA; [Wong, Ian; Seager, Sara] MIT, Dept Earth Atmospher & Planetary Sci, Cambridge, MA 02139 USA; [Kataria, Tiffany] NASA, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA USA; [Deming, Drake] Univ Maryland, Dept Astron, College Pk, MD 20742 USA; [Kreidberg, Laura] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heide...
推荐引用方式 GB/T 7714	Crossfield, Ian J. M.,Dragomir, Diana,Cowan, Nicolas B.,et al. Phase Curves of Hot Neptune LTT 9779b Suggest a High-metallicity Atmosphere[J],2020,903(1).
APA	Crossfield, Ian J. M..,Dragomir, Diana.,Cowan, Nicolas B..,Daylan, Tansu.,Wong, Ian.,...&Jenkins, Jon M..(2020).Phase Curves of Hot Neptune LTT 9779b Suggest a High-metallicity Atmosphere.ASTROPHYSICAL JOURNAL LETTERS,903(1).
MLA	Crossfield, Ian J. M.,et al."Phase Curves of Hot Neptune LTT 9779b Suggest a High-metallicity Atmosphere".ASTROPHYSICAL JOURNAL LETTERS 903.1(2020).