J/AJ/160/96 CORALIE and PFS radial velocities of HD 86226 (Teske+, 2020)
TESS reveals a short-period sub-Neptune sibling (HD86226c) to a known
long-period giant planet.
Teske J., Diaz M.R., Luque R., Mocnik T., Seidel J.V., Otegi J.F., Feng F.,
Jenkins J.S., Palle E., Segransan D., Udry S., Collins K.A., Eastman J.D.,
Ricker G.R., Vanderspek R., Latham D.W., Seager S., Winn J.N., Jenkins J.M.,
Anderson D.R., Barclay T., Bouchy F., Burt J.A., Butler R.P., Caldwell D.A.,
Collins K.I., Crane J.D., Dorn C., Flowers E., Haldemann J., Helled R.,
Hellier C., Jensen E.L.N., Kane S.R., Law N., Lissauer J.J., Mann A.W.,
Marmier M., Nielsen L.D., Rose M.E., Shectman S.A., Shporer A., Torres G.,
Wang S.X., Wolfgang A., Wong I., Ziegler C.
<Astron. J., 160, 96 (2020)>
=2020AJ....160...96T 2020AJ....160...96T
ADC_Keywords: Exoplanets; Stars, G-type; Spectra, optical; Radial velocities
Keywords: Exoplanet astronomy ; Exoplanet systems
Abstract:
The Transiting Exoplanet Survey Satellite (TESS) mission was designed
to find transiting planets around bright, nearby stars. Here, we
present the detection and mass measurement of a small, short-period
(∼4days) transiting planet around the bright (V=7.9), solar-type star
HD86226 (TOI-652, TIC22221375), previously known to host a long-period
(∼1600days) giant planet. HD86226c (TOI-652.01) has a radius of
2.16±0.08R⊕ and a mass of 7.25-1.12+1.19M⊕,
based on archival and new radial velocity data. We also update the
parameters of the longer-period, not-known-to-transit planet, and find
it to be less eccentric and less massive than previously reported. The
density of the transiting planet is 3.97g/cm3, which is low enough
to suggest that the planet has at least a small volatile envelope, but
the mass fractions of rock, iron, and water are not well- constrained.
Given the host star brightness, planet period, and location of the
planet near both the "radius gap" and the "hot Neptune desert,"
HD86226c is an interesting candidate for transmission spectroscopy to
further refine its composition.
Description:
HD86226 has been monitored by the high-resolution spectrograph CORALIE
on the Swiss 1.2m Euler telescope in La Silla Observatory, Chile,
starting in 1999 March. The present instrument version, CORALIE14, has
a resolving power of R∼60000.
HD86226 has been monitored with the Planet Finder Spectrograph (PFS).
The PFS detector was upgraded in February 2018. To take into account
the change in the velocity zero-point offset between the different
setups, throughout the analysis we refer to the data prior to the CCD
upgrade as PFS1 (R∼80000) and the post-fix data with the new detector
as PFS2 (R∼130000). Exposure times for HD86226 ranged from roughly
5-15 minutes with PFS1 and 10-20 minutes with PFS2.
Objects:
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RA (2000) DE Designation(s)
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09 56 29.84 -24 05 57.8 HD 86226 = HD 86226
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 69 27 New CORALIE radial velocities for HD86226
table3.dat 69 105 Planet Finder Spectroscope (PFS) radial velocities
for HD86226
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See also:
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
I/311 : Hipparcos, the New Reduction (van Leeuwen, 2007)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
V/117 : Geneva-Copenhagen Survey of Solar neighbourhood (Holmberg+, 2007)
V/130 : Geneva-Copenhagen Survey of Solar neighbourhood III (Holmberg+, 2009)
J/ApJS/152/261 : Chromospheric Ca II emission in nearby stars (Wright+, 2004)
J/A+A/495/959 : Radial velocity curve of HD 189733 (Boisse+, 2009)
J/ApJ/710/1724 : Follow-up photometry for HAT-P-11 (Bakos+, 2010)
J/ApJ/715/1050 : Predicted abundances for extrasolar planets. I. (Bond+, 2010)
J/ApJ/734/70 : Chromospheric activity of Southern stars (Arriagada, 2011)
J/A+A/530/A138 : Geneva-Copenhagen survey re-analysis (Casagrande+, 2011)
J/A+A/546/A27 : Radial velocity and photometry for GJ3470 (Bonfils+, 2012)
J/ApJ/760/44 : Predicted terrestrial planet abundances (Carter-Bond+, 2012)
J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)
J/A+A/556/A150 : SWEETCat I. Stellar parameters for host stars (Santos+, 2013)
J/A+A/564/A125 : AGN Torus model comparison of AGN in the CDFS (Buchner+, 2014)
J/ApJS/211/24 : Rotation periods of Kepler MS stars (McQuillan+, 2014)
J/ApJ/788/48 : X-ray through NIR photometry of NGC 2617 (Shappee+, 2014)
J/A+A/574/A124 : Spectroscopy of solar twins and analogues (Datson+, 2015)
J/ApJ/825/19 : Mass-radius relation. for planets with Rp<4 (Wolfgang+, 2016)
J/AJ/154/109 : California-Kepler Survey. III. Planet radii (Fulton+, 2017)
J/AJ/156/264 : CKS. VII. Planet radius gap (Fulton+, 2018)
J/A+A/619/L10 : pi Men radial velocity curves (Gandolfi+, 2018)
J/AJ/157/52 : Radial velocity obs. in super-Earth systems (Bryan+, 2019)
J/A+A/628/A9 : MASCARA-2b transmission spectra (Casasayas-Barris+, 2019)
J/A+A/627/A43 : Two super-Earths orbiting TOI-402 (Dumusque+, 2019)
J/A+A/628/A39 : Radial velocities of GJ 357 (Luque+, 2019)
Byte-by-byte Description of file: table[23].dat
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Bytes Format Units Label Explanations
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1- 25 F25.20 d BJD Barycentric corrected time; BJD-2450000 (1)
27- 38 F12.6 m/s RVel Radial Velocity
40- 48 F9.6 m/s e_RVel Velocity error
50- 57 F8.6 --- Ha-index ? Halpha activity index
59- 64 F6.4 --- S-index ? Ca H&K activity index
66- 69 A4 --- Inst Instrument used (2)
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Note (1): These dates were converted from JD_UTC to BJD_TDB.
Note (2): Instruments as follows :
CORA = CORALIE high-resolution spectrograph (27 occurrences)
pfs1 = Planet Finder Spectrograph, data prior to the CCD upgrade
(48 occurrences)
pfs2 = Planet Finder Spectrograph, post-fix data with the new detector
(57 occurrences)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 20-Oct-2020