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TOI-1201 b: A mini-Neptune transiting a bright and moderately young M dwarf | | D. Kossakowski
; J. Kemmer
; P. Bluhm
; S. Stock
; J. A. Caballero
; V. J. S. Béjar
; C. Cardona Guillén
; N. Lodieu
; K. A. Collins
; M. Oshagh
; M. Schlecker
; N. Espinoza
; E. Pallé
; Th. Henning
; L. Kreidberg
; M. Kürster
; P. J. Amado
; D. R. Anderson
; J. C. Morales
; D. Conti
; D. Galadi-Enriquez
; P. Guerra
; S. Cartwright
; D. Charbonneau
; P. Chaturvedi
; C. Cifuentes
; M. Cortes Contreras
; S. Dreizler
; C. Hellier
; C. Henze
; E. Herrero
; S. V. Jeffers
; J. M. Jenkins
; E.L.N. Jensen
; A. Kaminski
; J.F. Kielkopf
; M. Kunimoto
; M. Lafarga
; D.W. Latham
; J. Lillo-Box
; R. Luque
; K. Molvaerdikhani
; D. Montes
; G. Morello
; E.H. Morgan
; G. Nowak
; A. Pavlov
; M. Perger
; E.V. Quintana
; A. Quirrenbach
; S. Reffert
; A. Reiners
; G. Ricker
; I. Ribas
; C. Rodriguez Lopez
; M.R. Zapatero Osorio
; S. Seager
; P. Schoefer
; A. Schweitzer
; T. Trifonov
; S. Vanaverbeke
; R. Vanderspek
; R. West
; J. Winn
; M. Zechmeister
; | | Date: |
20 Sep 2021 | | Abstract: | We present the discovery of a transiting mini-Neptune around TOI-1201, a
relatively bright and moderately young early M dwarf ($J approx$ 9.5 mag,
$sim$600-800 Myr) in an equal-mass $sim$8 arcsecond-wide binary system, using
data from the Transiting Exoplanet Survey Satellite (TESS), along with
follow-up transit observations. With an orbital period of 2.49 d, TOI-1201 b is
a warm mini-Neptune with a radius of $R_mathrm{b} = 2.415pm0.090 R_oplus$.
This signal is also present in the precise radial velocity measurements from
CARMENES, confirming the existence of the planet and providing a planetary mass
of $M_mathrm{b} = 6.28pm0.88 M_oplus$ and, thus, an estimated bulk density
of $2.45^{+0.48}_{-0.42}$ g cm$^{-3}$. The spectroscopic observations
additionally show evidence of a signal with a period of 19 d and a long
periodic variation of undetermined origin. In combination with ground-based
photometric monitoring from WASP-South and ASAS-SN, we attribute the 19 d
signal to the stellar rotation period ($P_{rot}=$ 19-23 d), although we cannot
rule out that the variation seen in photometry belongs to the visually close
binary companion. We calculate precise stellar parameters for both TOI-1201 and
its companion. The transiting planet is an excellent target for atmosphere
characterization (the transmission spectroscopy metric is $97^{+21}_{-16}$)
with the upcoming James Webb Space Telescope. It is also feasible to measure
its spin-orbit alignment via the Rossiter-McLaughlin effect using current
state-of-the-art spectrographs with submeter per second radial velocity
precision. | | Source: | arXiv, 2109.09346 | | Services: | Forum | Review | PDF | Favorites | |
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