Query : 2022A&A...662A..51B

2022A&A...662A..51B - Astronomy and Astrophysics, volume 662A, 51-51 (2022/6-1)

Exoplanet atmospheres at high resolution through a modest-size telescope. Fe II in MASCARA-2b and KELT-9b with FIES on the Nordic Optical Telescope.


Abstract (from CDS):

Ground-based, high-resolution spectrographs are providing us with an unprecedented view of the dynamics and chemistry of the atmospheres of planets outside the Solar System. While there are a large number of stable and precise high-resolution spectrographs on modest-size telescopes, it is the spectrographs at observatories with apertures larger than 3.5 m that dominate the atmospheric follow-up of exoplanets. In this work we explore the potential of characterising exoplanetary atmospheres with FIES, a high-resolution spectrograph at the 2.56 m Nordic Optical Telescope. We observed two transits of MASCARA-2 b (also known as KELT-20 b) and one transit of KELT-9 b to search for atomic iron, a species that has recently been discovered in both neutral and ionised forms in the atmospheres of these ultra-hot Jupiters using large telescopes. Using a cross-correlation method, we detect a signal of FeII at the 4.5σ and 4.0σ level in the transits of MaSCARA-2 b. We also detect FeII in the transit of KELT-9 b at the 8.5σ level. Although we do not find any significant Doppler shift in the signal of MASCARA-2 b, we do measure a moderate blueshift (3-6 km s–1) of the feature in KELT-9 b, which might be a manifestation of high-velocity winds transporting FeII from the planetary dayside to the nightside. Our work demonstrates the feasibility of investigating exoplanet atmospheres with FIES, and it potentially unlocks a wealth of additional atmosphere detections with this and other high-resolution spectrographs mounted on similar-size telescopes.

Abstract Copyright: © ESO 2022

Journal keyword(s): instrumentation: spectrographs - planets and satellites: atmospheres - planets and satellites: gaseous planets

Simbad objects: 6

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Number of rows : 6
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
1 HD 10069b Pl 01 37 25.0335097438 -45 40 40.376513381           ~ 323 1
2 NAME CI Tau b Pl 04 33 52.0144455735 +22 50 30.093741884           ~ 22 0
3 HD 185603 EB* 19 38 38.7352230144 +31 13 09.217127532   7.67 7.58     A0 41 0
4 HD 185603b Pl 19 38 38.7352870670 +31 13 09.215701765           ~ 95 0
5 HD 195689b Pl 20 31 26.3534038246 +39 56 19.765154336           ~ 218 0
6 HD 195689 SB* 20 31 26.3534153736 +39 56 19.773037500   7.59 7.56     A0 98 0

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