Characterizing a World Within the Hot-Neptune Desert: Transit Observations of LTT 9779 b with the Hubble Space Telescope/WFC3

被引：11

作者：

Edwards, Billy ^{[1
,9
]}

Changeat, Quentin ^{[2
]}

Tsiaras, Angelos ^{[3
]}

Allan, Andrew ^{[4
]}

Behr, Patrick ^{[5
]}

Hagey, Simone R. ^{[6
]}

Himes, Michael D. ^{[7
,8
]}

Ma, Sushuang ^{[9
]}

Stassun, Keivan G. ^{[10
]}

Thomas, Luis ^{[9
,11
,12
]}

Thompson, Alexandra ^{[9
]}

Boley, Aaron ^{[6
]}

Booth, Luke ^{[13
]}

Bouwman, Jeroen ^{[14
]}

France, Kevin ^{[5
]}

Lowson, Nataliea ^{[15
]}

Meech, Annabella ^{[16
]}

Phillips, Caprice L. ^{[17
]}

Vidotto, Aline A. ^{[4
]}

Yip, Kai Hou ^{[9
]}

Bieger, Michelle ^{[18
]}

Gressier, Amelie ^{[19
]}

Janin, Estelle ^{[20
]}

Jiang, Ing-Guey ^{[21
,22
]}

Leonardi, Pietro ^{[23
,24
]}

Sarkar, Subhajit ^{[13
]}

Skaf, Nour ^{[9
,25
,26
]}

Taylor, Jake ^{[27
,28
,29
]}

Yang, Ming ^{[30
]}

Ward-Thompson, Derek ^{[31
]}

机构：

[1] SRON Netherlands Inst Space Res, SRON, Niels Bohrweg 4, NL-2333 CA Leiden, Netherlands

[2] Space Telescope Sci Inst STScI, European Space Agcy ESA, ESA Off, Baltimore, MD 21218 USA

[3] INAF, Osservatorio Astrofis Arcetri, Largo E Fermi 5, I-50125 Florence, Italy

[4] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands

[5] Univ Colorado Boulder, Lab Atmospher & Space Phys, Boulder, CO 80303 USA

[6] Univ British Columbia, 6224 Agr Rd, Vancouver, BC V6T 1Z1, Canada

[7] Univ Cent Florida, Dept Phys, Planetary Sci Grp, Orlando, FL USA

[8] NASA Goddard Space Flight Ctr, Greenbelt, MD USA

[9] UCL, Dept Phys & Astron, Gower St, London WC1E 6BT, England

[10] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[11] Univ Sternwarte Munchen, Scheinerstr 1, D-81679 Munich, Germany

[12] Max Planck Inst Extraterr Phys, Giessenbachstr 1, D-85748 Garching, Germany

[13] Cardiff Univ, Sch Phys & Astron, Cardiff Hub Astrophys Res & Technol CHART, Cardiff, Wales

[14] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[15] Univ Southern Queensland, Ctr Astrophys, 499-565 West St, Toowoomba, Qld 4350, Australia

[16] Univ Oxford, Dept Phys, Denys Wilkinson Bldg, Oxford OX1 3RH, England

[17] Ohio State Univ, Dept Astron, 100 W 18th Ave, Columbus, OH 43210 USA

[18] Univ Exeter, Coll Engn Math & Phys Sci, North Pk Rd, Exeter, England

[19] Space Telescope Sci Inst, 3700 San Martin Dr, Baltimore, MD 21218 USA

[20] Arizona State Univ, POB 871404, Tempe, AZ 85287 USA

[21] Natl Tsing Hua Univ, Dept Phys, Hsinchu 30013, Taiwan

[22] Natl Tsing Hua Univ, Inst Astron, Hsinchu 30013, Taiwan

[23] Univ Trento, Dipartimento Fis, Via Sommar 14, I-38123 Povo, Italy

[24] Univ Padua, Dipartimento Fis & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy

[25] Univ Paris Cite, Sorbonne Univ, LESIA, Observ Paris,Univ PSL,CNRS, 5 Pl Jules Janssen, F-92195 Meudon, France

[26] Natl Astron Observ Japan, Subaru Telescope, 650 North Aohoku Pl, Hilo, HI 96720 USA

[27] Univ Oxford, Dept Phys Atmospher Ocean & Planetary Phys, Parks Rd, Oxford OX1 3PU, England

[28] Univ Montreal, Inst Trottier Rech Exoplanetes, 1375 Ave Therese Lavoie Roux, Montreal, PQ H2V 0B3, Canada

[29] Univ Montreal, Dept Phys, 1375 Ave Therese Lavoie Roux, Montreal, PQ H2V 0B3, Canada

[30] Tongji Univ, Coll Surveying & Geoinformat, Shanghai 200092, Peoples R China

[31] Univ Cent Lancashire, Jeremiah Horrocks Inst, Preston PR1 2HE, England

来源：

ASTRONOMICAL JOURNAL | 2023年 / 166卷 / 04期

基金：

欧洲研究理事会;

关键词：

SPECTROSCOPIC PHASE-CURVE; TRANSMISSION SPECTRUM; WATER-VAPOR; MOLECULAR ABSORPTION; RETRIEVAL ANALYSIS; EMISSION-SPECTRUM; THERMAL INVERSION; ERROR-CORRECTION; ORBITAL DECAY; LINE LISTS;

D O I：

10.3847/1538-3881/acea77

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present an atmospheric analysis of LTT 9779 b, a rare planet situated in the hot-Neptune desert, that has been observed with Hubble Space Telescope (HST)/WFC3 with G102 and G141. The combined transmission spectrum, which covers 0.8-1.6 & mu;m, shows a gradual increase in transit depth with wavelength. Our preferred atmospheric model shows evidence for H2O, CO2, and FeH with a significance of 3.1 & sigma;, 2.4 & sigma;, and 2.1 & sigma;, respectively. In an attempt to constrain the rate of atmospheric escape for this planet, we search for the 1.083 & mu;m helium line in the G102 data but find no evidence of excess absorption that would indicate an escaping atmosphere using this tracer. We refine the orbital ephemerides of LTT 9779 b using our HST data and observations from TESS, searching for evidence of orbital decay or apsidal precession, which are not found. The phase-curve observation of LTT 9779 b with JWST NIRISS should provide deeper insights into the atmosphere of this planet and the expected atmospheric escape might be detected with further observations concentrated on other tracers such as Ly & alpha;.

引用

页数：26

共 4 条

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