J/AJ/162/167 Transits time of M-dwarf TOI-1749 (Fukui+, 2021)
TOI-1749: an M dwarf with a trio of planets including a near-resonant pair.
Fukui A., Korth J., Livingston J.H., Twicken J.D., Osorio M.R.Z.,
Jenkins J.M., Mori M., Murgas F., Ogihara M., Narita N., Palle E.,
Stassun K.G., Nowak G., Ciardi D.R., Alvarez-hernandez L., Bejar V.J.S.,
Casasayas-barris N., Crouzet N., De Leon J.P., Esparza-borges E.,
Soto D.H., Isogai K., Kawauchi K., Klagyivik P., Kodama T., Kurita S.,
Kusakabe N., Luque R., Madrigal-aguado A., Rodriguez P.M., Morello G.,
Nishiumi T., Orell-miquel J., Oshagh M., Parviainen H.,
Sanchez-benavente M., Stangret M., Terada Y., Watanabe N., Chen G.,
Tamura M., Bosch-cabot P., Bowen M., Eastridge K., Freour L., Gonzales E.,
Guerra P., Jundiyeh Y., Kim T.K., Kroer L.V., Levine A.M., Morgan E.H.,
Reefe M., Tronsgaard R., Wedderkopp C.K., Wittrock J., Collins K.A.,
Hesse K., Latham D.W., Ricker G.R., Seager S., Vanderspek R., Winn J.,
Bachelet E., Bowman M., Mccully C., Daily M., Harbeck D., Volgenau N.H.
<Astron. J., 162, 167-167 (2021)>
=2021AJ....162..167F 2021AJ....162..167F (SIMBAD/NED BibCode)
ADC_Keywords: Exoplanets; Stars, M-type; Stars, dwarfs;
Keywords: Transits; Exoplanet detection methods
Transit duration variation method; Super Earths; Mini Neptunes
M dwarf stars
Abstract:
We report the discovery of one super-Earth- (TOI-1749b) and two
sub-Neptune-sized planets (TOI-1749c and TOI-1749d) transiting an
early M dwarf at a distance of 100pc, which were first identified as
planetary candidates using data from the TESS photometric survey. We
have followed up this system from the ground by means of multiband
transit photometry, adaptive optics imaging, and low-resolution
spectroscopy, from which we have validated the planetary nature of the
candidates. We find that TOI-1749b, c, and d have orbital periods of
2.39, 4.49, and 9.05days, and radii of 1.4, 2.1, and 2.5R⊕,
respectively. We also place 95% confidence upper limits on the masses
of 57, 14, and 15M⊕ for TOI-1749b, c, and d, respectively, from
transit timing variations. The periods, sizes, and tentative masses of
these planets are in line with a scenario in which all three planets
initially had a hydrogen envelope on top of a rocky core, and only the
envelope of the innermost planet has been stripped away by
photoevaporation and/or core-powered mass-loss mechanisms. These
planets are similar to other planetary trios found around M dwarfs,
such as TOI-175b,c,d and TOI-270b,c,d, in the sense that the outer
pair has a period ratio within 1% of 2. Such a characteristic orbital
configuration, in which an additional planet is located interior to a
near 2:1 period-ratio pair, is relatively rare around FGK dwarfs.
Description:
TOI-1749 was observed by Transiting Exoplanets Survey Satellite (TESS)
with a 2 minutes cadence in 12 TESS sectors, specifically, Sectors
14-21 (from 2019 July 18 to 2020 February 18) and Sectors 23-26 (from
2020 March 18 to 2020 July 4).
We observed one, five, and four transits of TOI-1749b, TOI-1749c, and
TOI-1749d, respectively, between 2020 June and 2020 October with the
multiband imager MuSCAT2, which is mounted on the 1.52 m TCS telescope
of the Teide Observatory at Tenerife in the Canary Islands (Spain).
We observed one partial transit (ingress) of TOI-1749d on 2020
September 3 UT with the single-band imager Sinistro mounted on one of
the 1m telescopes of Las Cumbres Observatory (LCO) at McDonald
Observatory (USA).
We observed a partial transit (egress) and a full transit of TOI-1749d
on 2020 August 25 UT and 2020 September 12 UT, respectively, with the
single-band imager Spectral, which was mounted on the 2m Faulkes
Telescope North (FTN) of LCO at Haleakala Observatory in Hawaii.
In 2020 September, the new multiband imager MuSCAT3 was installed on
the FTN as a replacement for Spectral.
Objects:
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RA (2000) DE Designation(s)
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18 50 56.93 +64 25 10.08 TOI-1749 = TOI-1749
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 41 99 Mid times of individual transits
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See also:
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
J/ApJ/736/19 : Kepler planetary candidates. II. (Borucki+, 2011)
J/ApJS/197/8 : Kepler candidate multiple transiting planets (Lissauer+, 2011)
J/ApJ/790/146 : Planets in Kepler's multi-transiting systems (Fabrycky+, 2014)
J/ApJ/791/54 : Nearby M Dwarfs parameters (Gaidos+, 2014)
J/ApJ/804/64 : Empirical and model parameters of 183 M dwarfs (Mann+, 2015)
J/AJ/152/180 : Bolometric fluxes eclipsing binaries Tycho-2 (Stassun+, 2016)
J/ApJ/822/86 : False positive probabilities Q1-Q17 DR24 KOIs (Morton+, 2016)
J/A+A/600/A30 : Limb-darkening for TESS satellite (Claret, 2017)
J/AJ/153/71 : Kepler follow-up obs. program. I. Imaging (Furlan+, 2017)
J/AJ/153/136 : Planets & their host stars with Gaia plxs (Stassun+, 2017)
J/ApJ/834/17 : Mass & radius of planets, moons, low mass stars (Chen+, 2017)
J/ApJS/230/16 : 5 through L3 empirical stellar spectra SDSS (Kesseli+, 2017)
J/AJ/156/271 : The stellar membership of the Taurus SFR (Luhman, 2018)
J/A+A/629/A111 : L 98-59 (TOI 175) HARPS observations (Cloutier+, 2019)
J/ApJ/871/63 : How to constrain your Mdwarf II. Nearby binaries (Mann+, 2019)
J/A+A/642/A115 : CARMENES input catalogue of M dwarfs. V. (Cifuentes+, 2020)
J/A+A/649/A26 : TOI-178 six transiting planets (Leleu+, 2021)
J/ApJS/254/39 : Exoplanet candidates from TESS first 2yr obs (Guerrero+, 2021)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Epoch [0/102] Epoch sequence number
5- 16 F12.4 d TDB [2458685/2459144] Mid-transit time, Barycentric
Julian Date at TDB
18- 23 F6.4 d E_TDB [0.001/0.09] Upper error
25- 30 F6.4 d e_TDB [0.001/0.08] Lower error
32- 39 A8 --- Inst Instrument
41- 41 A1 --- Planet TOI-1749 Planet; c or d
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 17-Dec-2021