J/A+A/677/A182 TOI-2095 RVs and activity indicators (Murgas+, 2023)
Two super-Earths at the edge of the habitable zone of the nearby
M dwarf TOI-2095.
Murgas F., Castro-Gonzalez A., Palle E., Pozuelos F.J., Millholland S.,
Foo O., Korth J., Marfil E., Amado P.J., Caballero J.A., Christiansen J.L.,
Ciardi D.R., Collins K.A., Di Sora M., Fukui A., Gan T., Gonzales E.J.,
Henning T., Herrero E., Isopi G., Jenkins J.M., Lillo-Box J., Lodieu N.,
Luque R., Mallia F., Morales J.C., Morello G., Narita N., Orell-Miquel J.,
Parviainen H., Perez-Torres M., Quirrenbach A., Reiners A., Ribas I.,
Safonov B.S., Seager S., Schwarz R.P., Schweitzer A., Schlecker M.,
Strakhov I.A., Vanaverbeke S., Watanabe N., Winn J.N., Zechmeister M.
<Astron. Astrophys. 677, A182 (2023)>
=2023A&A...677A.182M 2023A&A...677A.182M (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Stars, M-type ;
Radial velocities ; Optical
Keywords: planets and satellites: detection - techniques: photometric -
techniques: radial velocities
Abstract:
The main scientific goal of TESS is to find planets smaller than
Neptune around stars that are bright enough to allow for further
characterization studies. Given our current instrumentation and
detection biases, M dwarfs are prime targets in the search for small
planets that are in (or near) the habitable zone of their host star.
In this work, we use photometric observations and CARMENES radial
velocity measurements to validate a pair of transiting planet
candidates found by TESS. The data were fitted simultaneously, using a
Bayesian Markov chain Monte Carlo (MCMC) procedure and taking into
account the stellar variability present in the photometric and
spectroscopic time series. We confirm the planetary origin of the two
transiting candidates orbiting around TOI-2095 (LSPM J1902+7525). The
star is a nearby M dwarf (d=41.90±0.03pc, Teff=3759±87K,
V=12.6mag), with a stellar mass and radius of M*=0.44±0.02M☉
and R*=0.44±0.02R☉, respectively. The planetary system is
composed of two transiting planets: TOI-2095b, with an orbital period
of Pb=17.66484±(7x10-5) days, and TOI-2095c, with
Pc=28.17232±(14x10-5) days. Both planets have similar sizes with
Rb=1.25±0.07R⊕ and Rc=1.33±0.08R⊕ for planet b
and planet c, respectively. Although we did not detect the induced RV
variations of any planet with significance, our CARMENES data allow us
to set stringent upper limits on the masses of these objects. We find
Mb<4.1M⊕ for the inner and Mc<7.4M⊕ for the outer
planet (95% confidence level). These two planets present equilibrium
temperatures in the range of 300-350K and are close to the inner edge
of the habitable zone of their star.
Description:
Radial velocity and activity indices of TOI 2095 taken with CARMENES.
Spectroscopic data reduced with SERVAL.
Objects:
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RA (2000) DE Designation(s)
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19 02 31.93 +75 25 06.9 TOI 2095 = LSPM J1902+7525
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablec1.dat 30 44 CARMENES visual channel (VIS) radial velocity
measurements of TOI-2095 computed by SERVAL
tablec2.dat 141 44 CARMENES spectroscopic line activity indicators
for TOI-2095 computed by SERVAL
tablec3.dat 61 44 CARMENES activity indicators from cross-correlation
for TOI-2095 computed by raccoon
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Byte-by-byte Description of file: tablec1.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD Barycentric Julian date (TDB)
17- 23 F7.3 m/s RV Radial velocity (VIS channel)
25- 30 F6.3 m/s e_RV Radial velocity error (VIS channel)
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Byte-by-byte Description of file: tablec2.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD Barycentric Julian date (TDB)
17- 22 F6.1 --- CRX Chromatic index (in m/s/Np)
25- 29 F5.1 --- e_CRX Chromatic index uncertainty(in m/s/Np)
33- 37 F5.1 m2/s2 dLW Differential line width
41- 44 F4.1 m2/s2 e_dLW Differential line width uncertainty
49- 53 F5.3 m/s Halpha Hα index
57- 61 F5.3 m/s e_Halpha Hα index uncertainty
65- 69 F5.3 m/s NaD1 Na D1 index
73- 77 F5.3 m/s e_NaD1 Na D1 index uncertainty
81- 85 F5.3 m/s NaD2 Na D2 index
89- 93 F5.3 m/s e_NaD2 Na D2 index uncertainty
97-101 F5.3 m/s CaIRT1 Ca IRT 1 index
105-109 F5.3 m/s e_CaIRT1 Ca IRT 1 index uncertainty
113-117 F5.3 m/s CaIRT2 Ca IRT 2 index
121-125 F5.3 m/s e_CaIRT2 Ca IRT 2 index uncertainty
129-133 F5.3 m/s CaIRT3 Ca IRT 3 index
137-141 F5.3 m/s e_CaIRT3 Ca IRT 3 index uncertainty
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Byte-by-byte Description of file: tablec3.dat
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Bytes Format Units Label Explanations
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1- 14 F14.6 d BJD Barycentric Julian date (TDB)
17- 21 F5.3 km/s FWHM CCF Full width at half maximum
25- 29 F5.3 km/s e_FWHM CCF Full width at half maximum uncertainty
33- 37 F5.2 % Cont CCF contrast
41- 44 F4.2 % e_Cont CCF contrast uncertainty
49- 54 F6.3 km/s BIS CCF Bisector
57- 61 F5.3 km/s e_BIS CCF Bisector
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Acknowledgements:
Felipe Murgas, fmurgas(at)iac.es
(End) Felipe Murgas [IAC, Spain], Patricia Vannier [CDS] 08-Sep-2023