High-resolution Emission Spectroscopy of the Ultrahot Jupiter KELT-9b: Little Variation in Day- and Nightside Emission Line Contrasts

被引：9

作者：

Ridden-Harper, Andrew ^{[1
,2
]}

de Mooij, Ernst ^{[3
]}

Jayawardhana, Ray ^{[4
]}

Gibson, Neale ^{[5
]}

Karjalainen, Raine ^{[6
,7
,8
]}

Karjalainen, Marie ^{[6
]}

机构：

[1] Cornell Univ, Carl Sagan Inst, Dept Astron, Ithaca, NY 14853 USA

[2] Las Cumbres Observ, 6740 Cortona Dr, Suite 102, Goleta, CA 93117 USA

[3] Queen's Univ Belfast, Astrophys Res Ctr, Sch Math & Phys, Univ Rd, Belfast BT7 1NN, North Ireland

[4] Cornell Univ, Dept Astron, Ithaca, NY 14853 USA

[5] Trinity Coll Dublin, Sch Phys, Dublin, Ireland

[6] Czech Acad Sci, Astron Inst, Fricova 298, Ondr?ejov 25165, Czech Republic

[7] Inst Astrofis Canarias, c-Via Lactea S-N Laguna, E-38205 Tenerife, Spain

[8] Isaac Newton Grp Telescopes, Apartado Correos 321, E-38700 Santa Cruz De La Palma, Spain

来源：

ASTRONOMICAL JOURNAL | 2023年 / 165卷 / 05期

关键词：

TRANSMISSION SPECTRUM; EXOPLANET ATMOSPHERES; THERMAL-DISSOCIATION; IONIZED CALCIUM; GAPS PROGRAM; WATER-VAPOR; HARPS-N; FE I; DAYSIDE; WINDS;

D O I：

10.3847/1538-3881/acc654

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The transmission spectrum of the ultrahot Jupiter KELT-9b (T (eq) similar to 4000 K) exhibits absorption by several metal species. We searched for atomic and molecular lines in its emission spectrum by observing partial phase curves with the Calar Alto high-Resolution search for M dwarfs with Exoearths with Near-infrared and optical Echelle Spectrographs (R similar to 80,000-95,000). We find evidence for emission by Si i in the atmosphere of KELT-9b for the first time. Additionally we find evidence for emission by Mg i and Ca ii, which were previously detected in transmission, and confirmed earlier detections of Fe i emission. Conversely, we find no evidence for dayside emission from Al i, Ca i, Cr i, FeH, Fe ii, K i, Li i, Mg ii, Na i, OH, Ti i, TiO, V i, V ii, VO, and Y i. By employing likelihood mapping, we find indications of there being little variation in emission line contrast between the day- and nightsides-suggesting that KELT-9b may harbor iron emission on its nightside. Our results demonstrate that high-resolution ground-based emission spectroscopy can provide valuable insights into exoplanet atmospheres.

引用

页数：20