J/AJ/163/133 VRI photometry and radial velocity of TOI-1759 (Espinoza+, 2022)
A Transiting, Temperate Mini-Neptune Orbiting the M Dwarf TOI-1759 Unveiled by
TESS.
Espinoza N., Palle E., Kemmer J., Luque R., Caballero J.A., Cifuentes C.,
Herrero E., Sanchez Bejar V.J., Stock S., Molaverdikhani K., Morello G.,
Kossakowski D., Schlecker M., Amado P.J., Bluhm P., Cortes-Contreras M.,
Henning T., Kreidberg L., Kurster M., Lafarga M., Lodieu N., Morales J.C.,
Oshagh M., Passegger V.M., Pavlov A., Quirrenbach A., Reffert S.,
Reiners A., Ribas I., Rodriguez E., Lopez C.R., Schweitzer A., Trifonov T.,
Chaturvedi P., Dreizler S., Jeffers S.V., Kaminski A., Lopez-Gonzalez M.J.,
Lillo-Box J., Montes D., Nowak G., Pedraz S., Vanaverbeke S.,
Zapatero Osorio M.R., Zechmeister M., Collins K.A., Girardin E., Guerra P.,
Naves R., Crossfield I.J.M., Matthews E.C., Howell S.B., Ciardi D.R.,
Gonzales E., Matson R.A., Beichman C.A., Schlieder J.E., Barclay T.,
Vezie M., Villasenor J.N., Daylan T., Mireies I., Dragomir D., Twicken J.D.,
Jenkins J., Winn J.N., Latham D., Ricker G., Seager S.
<Astron. J., 163, 133 (2022)>
=2022AJ....163..133E 2022AJ....163..133E
ADC_Keywords: Exoplanets; Stars, M-type; Photometry, VRI; Radial velocities
Keywords: Exoplanet astronomy
Abstract:
We report the discovery and characterization of TOI-1759b, a temperate
(400K) sub-Neptune-sized exoplanet orbiting the M-dwarf TOI-1759
(TIC408636441). TOI-1759b was observed by TESS to transit in Sectors
16, 17, and 24, with only one transit observed per sector, creating an
ambiguity regarding the orbital period of the planet candidate.
Ground-based photometric observations, combined with radial-velocity
measurements obtained with the CARMENES spectrograph, confirm an
actual period of 18.85019±0.00014days. A joint analysis of all
available photometry and radial velocities reveals a radius of
3.17±0.10R⊕ and a mass of 10.8±1.5M⊕. Combining
this with the stellar properties derived for TOI-1759
(R*=0.597±0.015R☉; M*=0.606±0.020M☉;
Teff=4065±51K), we compute a transmission spectroscopic metric
(TSM) value of over 80 for the planet, making it a good target for
transmission spectroscopy studies. TOI-1759b is among the top five
temperate, small exoplanets (Teq<500K, Rp<4R⊕) with the highest
TSM discovered to date. Two additional signals with periods of 80 days
and >200 days seem to be present in our radial velocities. While our
data suggest both could arise from stellar activity, the later
signal's source and periodicity are hard to pinpoint given the ∼200
days baseline of our radial-velocity campaign with CARMENES. Longer
baseline radial-velocity campaigns should be performed in order to
unveil the true nature of this long-period signal.
Description:
The 2 minutes cadence data were processed in the TESS Science
Processing Operations Center (SPOC) photometry and transit search
pipelines at NASA Ames Research Center, in Sectors 16 (2019 September
to October), 17 (2019 October to November), and 24 (2020 April to
May).
Among the observations, a transit of TOI-1759b in 2020 May 21 was
captured by three independent telescopes/observatories: the OAA
telescope of the Observatori Astronomic Albanya (Spain; precision of
1140ppm; R-filter observations), the RCO telescope of the Grand-Pra
Observatory (Valais Sion, Switzerland; precision of 1080ppm; ip-filter
observations), and the OMC telescope of the Montcabrer Observatory
(Barcelona, Spain; precision of 1500ppm; Ic-filter observations).
Long-term photometric monitoring was also performed from the ground
using the 0.8m Joan Oro telescope (TJO) at the Montsec Observatory in
Lleida, Spain and the 90cm telescope at the Sierra Nevada Observatory
(SNO) in R and V filter.
We monitored TOI-1759 with the CARMENES 38 instrument located on the
3.5m telescope at the Calar Alto Observatory in Almeria, Spain, from
2020 July 24 to 2021 January 17 (R=94600).
Objects:
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RA (2000) DE Designation(s) (Period)
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21 47 24.79 +62 45 13.9 TOI-1759 = LSPM J2147+6245 (P=18.85d)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 138 57 Radial velocity measurements for the star along
with activity indicators at each epoch
table6.dat 68 48816 Photometric transits of the planet
table7.dat 64 3143 Long-term photometric measurements of TOI-1759
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
II/328 : AllWISE Data Release (Cutri+ 2013)
IV/38 : TESS Input Catalog - v8.0 (TIC-8) (Stassun+, 2019)
VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)
J/A+A/492/277 : Analysis of Collinder 69 stars with VOSA (Bayo+, 2008)
J/AJ/145/102 : Spectro. bright M dwarfs in the northern sky (Lepine+, 2013)
J/AJ/153/71 : Kepler follow-up observation program I Imaging (Furlan+, 2017)
J/AJ/156/264 : California-Kepler Survey VII Planet radius gap (Fulton+, 2018)
J/A+A/629/A111 : L 98-59 (TOI 175) HARPS observations (Cloutier+, 2019)
J/AJ/158/109 : Occurrence rates of planets orbiting FGK stars (Hsu+, 2019)
J/AJ/157/211 : Unresolved binaries TESS with speckle imaging (Matson+, 2019)
J/other/Sci/365.1441 : GJ 3512 radial velocity & light curves (Morales+, 2019)
J/A+A/627/A161 : CARMENES stars multiwavelength measurements (Passegger+, 2019)
J/A+A/623/A44 : CARMENES M-dwarfs activity indicators (Schoefer+, 2019)
J/A+A/625/A68 : Radii and masses of the CARMENES targets (Schweitzer+, 2019)
J/A+A/642/A115 : CARMENES input catalogue of M dwarfs. V. (Cifuentes+, 2020)
J/AJ/159/239 : Transmission Spectroscopy Metric of exoplanets (Guo+, 2020)
J/A+A/636/A36 : Absolute radial velocities CARMENES M dwarfs (Lafarga+, 2020)
J/A+A/636/A119 : YZCeti CARMENES and HARPS radial velocity curve (Stock+, 2020)
J/A+A/643/A112 : CARMENES VIS RVs of 3 M dwarfs (Stock+, 2020)
J/A+A/650/A188 : G 264-012 and Gl 393 radial velocity curves (Amado+, 2021)
J/A+A/649/A6 : Gaia Catalogue of Nearby Stars-GCNS (Gaia collaboration, 2021)
J/ApJS/254/39 : Exoplanet candidates from TESS first 2yr obs (Guerrero+, 2021)
J/A+A/649/A26 : TOI-178 six transiting planets (Leleu+, 2021)
J/A+A/656/A162 : CARMENES stellar atmospheric parameters (Marfil+, 2021)
J/AJ/161/174 : Transit depth biases & error bars 31 planets (Morello+, 2021)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Target Target name
10- 19 F10.5 d BJD [9054/9233] Time, BJD-2450000
21- 26 F6.2 m/s RVel [-11.1/8.44] Radial velocity
28- 31 F4.2 m/s e_RVel [1/7] Error on RVel
33- 38 F6.2 --- CRX [-61.1/49.5] Chromatic index, m/s/Np (Neper)
40- 45 F6.2 m2/s2 dLW [-27.9/30.7] dLW Differential line-width, 1e3
47- 53 F7.4 km/s BIS [-0.44/0.009] Bisector span
55- 59 F5.3 km/s EWHa [0.02/0.13] Equivalent Width, H-alpha
61- 67 F7.4 km/s CaII-a [-0.008/0.04] CaII IRT a indicator
69- 74 F6.4 km/s CaII-b [0.02/0.09] CaII IRT b indicator
76- 82 F7.4 km/s CaII-c [-0.02/0.06] CaII IRT c indicator
84- 89 F6.4 km/s TiO7050 [0.87/0.89] TiO indicator at 7050Angstroms
91- 96 F6.4 km/s TiO8430 [0.85/0.89] TiO indicator at 8430Angstroms
98-103 F6.4 km/s TiO8860 [0.96/1] TiO indicator at 8860Angstroms
105-111 F7.4 km/s HPb [-0.01/0.009] Paschen Beta line indicator
113-119 F7.4 km/s He [-0.04/-0.005] indicator at 10833Angstroms
121-132 A12 --- Instr Instrument name
134-138 F5.1 --- SNR [25.7/120] Signal-to-noise ratio at order 36
(840nm)
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Target Target Name
10- 19 F10.5 d BJD [8738/8991] Time, BJD-2450000
21- 28 F8.6 --- Flux [0.98/1.03] Relative flux
30- 37 F8.6 --- e_Flux [0.001/0.002] Uncertainty in Flux
39- 61 A23 --- Instr Instrument
63- 68 F6.3 --- AMass [-1.45/2.22]? Standarized airmass (1)
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Note (1): The Standarized Airmass column corresponds to the airmass values
substracted by their mean and divided by their standard deviation.
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Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Target Target Name
10- 19 F10.5 d BJD [9010/9458] Time, BJD-2450000
21- 28 F8.6 --- Flux [0.97/1.04] Relative flux
30- 37 F8.6 --- e_Flux [0.0006/0.004] Uncertainty in Flux
39- 64 A26 --- Instr Instrument
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 22-Apr-2022