High-resolution transmission spectroscopy of MASCARA-2 b with EXPRES

被引：56

作者：

Hoeijmakers, H. Jens ^{[1
,2
]}

Cabot, Samuel H. C. ^{[3
]}

Zhao, Lily ^{[3
]}

Buchhave, Lars A. ^{[4
]}

Tronsgaard, Rene ^{[4
]}

Davis, Allen B. ^{[3
]}

Kitzmann, Daniel ^{[2
]}

Grimm, Simon L. ^{[2
]}

Cegla, Heather M. ^{[1
]}

Bourrier, Vincent ^{[1
]}

Ehrenreich, David ^{[1
]}

Heng, Kevin ^{[2
,5
]}

Lovis, Christophe ^{[1
]}

Fischer, Debra A. ^{[3
]}

机构：

[1] Observ Geneva, Chemin Maillettes 51, CH-1290 Versoix, Switzerland

[2] Univ Bern, Ctr Space & Habitabil, Gesellschaftsstr 6, CH-3012 Bern, Switzerland

[3] Yale Univ, 52 Hillhouse, New Haven, CT 06511 USA

[4] Tech Univ Denmark, Natl Space Inst, DTU Space, Elektrovej 328, DK-2800 Lyngby, Denmark

[5] Univ Warwick, Dept Phys, Astron & Astrophys Grp, Coventry CV4 7AL, W Midlands, England

来源：

ASTRONOMY & ASTROPHYSICS | 2020年 / 641卷 / 641期

基金：

瑞士国家科学基金会; 欧盟地平线“2020”;

关键词：

instrumentation: spectrographs; planets and satellites: atmospheres; techniques: spectroscopic; planets and satellites: gaseous planets; ORBITAL MOTION; EXOPLANET; ATMOSPHERE; ABSORPTION; SODIUM; PLANET;

D O I：

10.1051/0004-6361/202037437

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report detections of atomic species in the atmosphere of MASCARA-2 b, using the first transit observations obtained with the newly commissioned EXPRES spectrograph. EXPRES is a highly stabilized optical echelle spectrograph, designed to detect stellar reflex motions with amplitudes down to 30 cm s(-1), and has recently been deployed at the Lowell Discovery Telescope. By analyzing the transmission spectrum of the ultra-hot Jupiter MASCARA-2 b using the cross-correlation method, we confirm previous detections of FeI, FeII, and NaI, which likely originate in the upper regions of the inflated atmosphere. In addition, we report significant detections of MgI and CrII. The absorption strengths change slightly with time, possibly indicating different temperatures and chemistry in the day- and nightside terminators. Using the effective stellar line-shape variation induced by the transiting planet, we constrain the projected spin-orbit misalignment of the system to 1.6 +/- 3.1 degrees, consistent with an aligned orbit. We demonstrate that EXPRES joins a suite of instruments capable of phase-resolved spectroscopy of exoplanet atmospheres.

引用

页数：17

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