J/A+A/619/L10 pi Men radial velocity curves (Gandolfi+, 2018)
TESS's first planet. A super-Earth transiting the naked-eye star pi Mensae.
Gandolfi D., Barragan O., Livingston J.H., Fridlund M., Justesen A.B.,
Redfield S., Fossati L., Mathur S., Grziwa S., Cabrera J., Garcia R.A.,
Persson C.M., Van Eylen V., Hatzes A.P., Hidalgo D., Albrecht S., Bugnet L.,
Cochran W.D., Csizmadia Sz., Deeg H., Eigmueller P., Endl M., Erikson A.,
Esposito M., Guenther E., Korth J., Luque R., Montanes Rodriguez P.,
Nespral D., Nowak G., Paetzold M., Prieto-Arranz J.
<Astron. Astrophys. 619, L10 (2018)>
=2018A&A...619L..10G 2018A&A...619L..10G (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Exoplanets ; Radial velocities
Keywords: planetary systems - planets and satellites: detection -
planets and satellites: fundamental parameters -
planets and satellites: terrestrial planets -
stars: fundamental parameters
Abstract:
We report on the confirmation and mass determination of π Men c,
the first transiting planet discovered by NASA's TESS space mission.
π Men is a naked-eye (V=5.65mag), quiet G0 V star that was
previously known to host a sub-stellar companion (π Men b) on a
longperiod (Porb=2091-days), eccentric (e=0.64) orbit. Using TESS
time-series photometry, combined with Gaia data, published UCLES at
AAT Doppler measurements, and archival HARPS at ESO-3.6m radial
velocities, we found that π Men c is a close-in planet with an
orbital period of Porb=6.27-days, a mass of Mc=4.52±0.81M⊕,
and a radius of Rc=2.06±0.03R⊕. Based on the planet's
orbital period and size, π Men c is a super-Earth located at, or
close to, the radius gap, while its mass and bulk density suggest it
may have held on to a significant atmosphere. Because of the
brightness of the host star, this system is highly suitable for a wide
range of further studies to characterize the planetary atmosphere and
dynamical properties. We also performed an asteroseismic analysis of
the TESS data and detected a hint of power excess consistent with the
seismic values expected for this star, although this result depends on
the photometric aperture used to extract the light curve. This
marginal detection is expected from pre-launch simulations hinting at
the asteroseismic potential of the TESS mission for longer,
multi-sector observations and/or for more evolved bright stars.
Description:
We downloaded the TESS Sector 1 light curves from the MIT web site.
For the TESS object of interest TOI-144 (π Men, HD 39091,
TIC 261136679), the light curve is provided by the NASA Ames Science
Processing Operations Center (SPOC). The time-series includes 18036
short-cadence (Texp=2min) photometric measurements. TESS observations
started on 25 July 2018 and ended on 22 August 2018. We removed any
measurements that have a non-zero "quality" flag, that is, those
suffering from cosmic rays or instrumental issues.
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* *
* Sorry, but the author(s) never supplied the full table A2 *
* announced in the paper *
* *
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Objects:
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RA (2000) DE Designation(s)
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05 37 09.89 -80 28 08.8 pi Men = HD 39091
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 26 42 UCLES RV measurements of pi Men
tablea3.dat 50 16 HARPS RV measurements of pi Men acquired with
the new fiber bundle
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d BJD Barycentric Julian date in barycentric
dynamical time (BJD-2450000)
13- 19 F7.4 km/s RV UCLES radial velocity
21- 26 F6.4 km/s e_RV rms uncertainty on RV
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Byte-by-byte Description of file: tablea3.dat
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Bytes Format Units Label Explanations
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1- 11 F11.6 d BJD Barycentric Julian date in barycentric
dynamical time (BJD-2450000)
13- 19 F7.4 km/s RV HARPS radial velocity
21- 26 F6.4 km/s e_RV rms uncertainty on RV
28- 33 F6.4 km/s BIS Bisector span of the cross-correlation function
35- 40 F6.4 km.s FWHM FWHM of the cross-correlation function
42- 44 I3 s Texp Exposure time
46- 50 F5.1 --- S/N Signal-to-noise ration per pixel at 550nm
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 22-Nov-2018