Journal
ASTRONOMY & ASTROPHYSICS
Volume 641, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/202037437
Keywords
instrumentation: spectrographs; planets and satellites: atmospheres; techniques: spectroscopic; planets and satellites: gaseous planets
Categories
Funding
- PlanetS National Centre of Competence in Research (NCCR) - Swiss National Science Foundation (SNSF)
- NSF [NSF MRI-1429365, ATI-1509436]
- European Re-search Council (ERC) under the European Union's Horizon 2020 research and innovation program (project Four Aces) [724427]
- European Re-search Council (ERC) under the European Union's Horizon 2020 research and innovation program (project EXOKLEIN) [771620]
- HeisingSimons Foundation
- Yale Astronomy Department
- NSF GRFP
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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.
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