The Library
LRG-BEASTS : evidence for clouds in the transmission spectrum of HATS-46 b
Tools
Ahrer, Eva-Maria, Wheatley, Peter J., Gandhi, Siddharth, Kirk, J., King, George W., Louden, Tom M. and Welbanks, L. (2023) LRG-BEASTS : evidence for clouds in the transmission spectrum of HATS-46 b. Monthly Notices of the Royal Astronomical Society, 521 (4). pp. 5636-5644. doi:10.1093/mnras/stad779 ISSN 1365-2966.
|
PDF
stad779.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (4Mb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stad779
Abstract
We have performed low-resolution ground-based spectroscopy of HATS-46 b in transmission, using the EFOSC2 instrument on the ESO New Technology Telescope (NTT). HATS-46 b is a highly-inflated exoplanet that is a prime target for transmission spectroscopy, having a Jupiter-like radius (0.95 RJup) but a much lower mass (0.16 MJup). It orbits a G-type star with a 4.7 d period, giving an equilibrium temperature of 1100 K. We observed one transit of HATS-46 b with the NTT, with the time-series spectra covering a wavelength range of 3900–9000 Å at a resolution of R ∼ 380. We achieved a remarkably precise transmission spectrum of 1.03 × photon noise, with a median uncertainty of 357 ppm for ∼200 Å wide bins, despite the relative faintness of the host star with Vmag = 13.6. The transmission spectrum does not show strong absorption features and retrievals favour a cloudy model, ruling out a clear atmosphere with 3.0σ confidence. We also place a conservative upper limit on the sodium abundance under the alternative scenario of a clear atmosphere. This is the eighth planet in the LRG-BEASTS survey, which uses 4 m-class telescopes such as the NTT to obtain low-resolution transmission spectra of hot Jupiters with precisions of around one atmospheric scale height.
Item Type: | Journal Article | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Subjects: | Q Science > QB Astronomy | |||||||||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
SWORD Depositor: | Library Publications Router | |||||||||||||||
Library of Congress Subject Headings (LCSH): | Transits, Extrasolar planets -- Atmospheres, Extrasolar planets -- Detection, Astronomical spectroscopy, Astronomical photometry | |||||||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||
Publisher: | Oxford University Press (OUP) | |||||||||||||||
ISSN: | 1365-2966 | |||||||||||||||
Official Date: | June 2023 | |||||||||||||||
Dates: |
|
|||||||||||||||
Volume: | 521 | |||||||||||||||
Number: | 4 | |||||||||||||||
Page Range: | pp. 5636-5644 | |||||||||||||||
DOI: | 10.1093/mnras/stad779 | |||||||||||||||
Status: | Peer Reviewed | |||||||||||||||
Publication Status: | Published | |||||||||||||||
Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||
Date of first compliant deposit: | 31 May 2023 | |||||||||||||||
Date of first compliant Open Access: | 31 May 2023 | |||||||||||||||
RIOXX Funder/Project Grant: |
|
|||||||||||||||
Related URLs: |
Request changes or add full text files to a record
Repository staff actions (login required)
View Item |
Downloads
Downloads per month over past year