TY - JOUR
T1 - WASP-193b
T2 - An extremely low-density super-Neptune
AU - Barkaoui, Khalid
AU - Pozuelos, Francisco J.
AU - Hellier, Coel
AU - Smalley, Barry
AU - Nielsen, Louise D.
AU - Dorn, Caroline
AU - Niraula, Prajwal
AU - Gillon, Michaël
AU - Wit, Julien de
AU - Helled, Ravit
AU - Müller, Simon
AU - Jehin, Emmanuel
AU - Demory, Brice-Olivier
AU - Grootel, V. Van
AU - Soubkiou, Abderahmane
AU - Ghachoui, Mourad
AU - Anderson, David R.
AU - Benkhaldoun, Zouhair
AU - Bouchy, Francois
AU - Burdanov, Artem
AU - Delrez, Laetitia
AU - Ducrot, Elsa
AU - Garcia, Lionel
AU - Jabiri, Abdelhadi
AU - Lendl, Monika
AU - Maxted, Pierre F. L.
AU - Murray, Catriona A.
AU - Pedersen, Peter Pihlmann
AU - Queloz, Didier
AU - Sebastian, Daniel
AU - Turner, Oliver
AU - Udry, Stephane
AU - Timmermans, Mathilde
AU - Triaud, Amaury H. M. J.
AU - West, Richard G.
N1 - Not yet published as of 14/03/2025.
PY - 2023/8/29
Y1 - 2023/8/29
N2 - Gas giants transiting bright nearby stars are stepping stones for our understanding of planetary system formation and evolution mechanisms. This paper presents a particularly interesting new specimen of this kind of exoplanet discovered by the WASP-South transit survey, WASP-193b. This planet completes an orbit around its Vmag = 12.2 F9 main-sequence host star every 6.25 d. Our analyses found that WASP-193b has a mass of Mp = 0.139 ± 0.029 MJup and a radius of Rp = 1.464 ± 0.058 RJup, translating into an extremely low density of ρp = 0.059 ± 0.014 g/cm3. The planet was confirmed photometrically by the 0.6-m TRAPPIST-South, the 1.0-m SPECULOOS-South telescopes, and the TESS mission, and spectroscopically by the ESO-3.6-m/HARPS and Euler-1.2-m/CORALIE spectrographs. The combination of its large transit depth (dF~1.4 %), its extremely-low density, its high-equilibrium temperature (Teq = 1254 ± 31 K), and the infrared brightness of its host star (magnitude Kmag=10.7) makes WASP-193b an exquisite target for characterization by transmission spectroscopy (transmission spectroscopy metric: TSM ~ 600). One single JWST transit observation would yield detailed insights into its atmospheric properties and planetary mass, within ~0.1 dex and ~1% (vs ~20% currently with radial velocity data) respectively.
AB - Gas giants transiting bright nearby stars are stepping stones for our understanding of planetary system formation and evolution mechanisms. This paper presents a particularly interesting new specimen of this kind of exoplanet discovered by the WASP-South transit survey, WASP-193b. This planet completes an orbit around its Vmag = 12.2 F9 main-sequence host star every 6.25 d. Our analyses found that WASP-193b has a mass of Mp = 0.139 ± 0.029 MJup and a radius of Rp = 1.464 ± 0.058 RJup, translating into an extremely low density of ρp = 0.059 ± 0.014 g/cm3. The planet was confirmed photometrically by the 0.6-m TRAPPIST-South, the 1.0-m SPECULOOS-South telescopes, and the TESS mission, and spectroscopically by the ESO-3.6-m/HARPS and Euler-1.2-m/CORALIE spectrographs. The combination of its large transit depth (dF~1.4 %), its extremely-low density, its high-equilibrium temperature (Teq = 1254 ± 31 K), and the infrared brightness of its host star (magnitude Kmag=10.7) makes WASP-193b an exquisite target for characterization by transmission spectroscopy (transmission spectroscopy metric: TSM ~ 600). One single JWST transit observation would yield detailed insights into its atmospheric properties and planetary mass, within ~0.1 dex and ~1% (vs ~20% currently with radial velocity data) respectively.
UR - http://www.aanda.org/
M3 - Article
SN - 0004-6361
JO - Astronomy and Astrophysics
JF - Astronomy and Astrophysics
ER -