J/AJ/157/149 Transit parameters for planets around subgiants (Luhn+, 2019)
Retired A stars and their companions.
VIII. 15 new planetary signals around subgiants and transit parameters for
California Planet Search planets with subgiant hosts.
Luhn J.K., Bastien F.A., Wright J.T., Johnson J.A., Howard A.W.,
Isaacson H.
<Astron. J., 157, 149-149 (2019)>
=2019AJ....157..149L 2019AJ....157..149L (SIMBAD/NED BibCode)
ADC_Keywords: Stars, giant ; Stars, A-type ; Exoplanets ; Stars, masses ;
Stars, diameters ; Effective temperatures ; Radial velocities
Keywords: planets and satellites: detection -
planets and satellites: fundamental parameters -
techniques: radial velocities
Abstract:
We present the discovery of seven new planets and eight planet candidates
around subgiant stars, as additions to the known sample of planets around
"retired A stars". Among these are the possible first three-planet systems
around subgiant stars, HD 163607 and HD 4917. Additionally, we present
calculations of possible transit times, durations, depths, and
probabilities for all known planets around subgiant (3<logg<4) stars,
focused on possible transits during the TESS mission. While most have
transit probabilities of 1%-2%, we find that there are three planets
with transit probabilities >9%.
Description:
Our sample is composed of stars observed as part of the California Planet
Search (CPS) with 3.0<logg<4.0. From this sample of over 400 stars, we
have identified those that are known to host planets, as identified in
either www.exoplanets.org or www.exoplanet.eu. Observations were taken
at Keck Observatory using the High Resolution Echelle Spectrometer (HIRES)
with a resolution of R∼55000. For a V=8 magnitude star, the exposure
required is 90 s to reach a signal-to-noise ratio of 190 at 5800 Å.
RVs are calculated using the iodine-cell calibration technique and the
forward-modeling procedure described in Butler et al. (1996PASP..108..500B 1996PASP..108..500B)
and later Howard et al. (2011ApJ...726...73H 2011ApJ...726...73H). For several stars that were
known planet hosts, we included the non-Keck RV measurements as published
with the planet discovery.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 72 72 Stellar parameters for subgiants with known
companions
table3.dat 161 84 Orbital parameters
table4.dat 41 4286 Radial velocities
table5.dat 142 84 Transit parameters for known planets around
subgiants
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See also:
J/ApJS/182/97 : Radial velocities of multi-planet systems (Wittenmyer+, 2009)
J/A+A/585/A134 : HD1461, HD40307, and HD204313 radial velocities (Diaz+, 2016)
J/ApJS/225/32 : Extended abundance analysis of cool stars (Brewer+, 2016)
J/ApJ/834/17 : Mass + radius of planets, moons, low mass stars (Chen+, 2017)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Star name (HD NNNNNN)
11- 19 F9.5 deg RAdeg Right Ascension in decimal degrees (J2000)
21- 29 F9.5 deg DEdeg Declination in decimal degrees (J2000)
31- 34 F4.2 mag Vmag [4.79/9.01] V-band magnitude (1)
36- 39 F4.2 Msun M* [1.01/1.75] Stellar mass (1)
41- 44 F4.2 Rsun R* [1.48/7] Stellar radius (1)
46- 49 I4 K Teff [4779/5933] Stellar effective temperature (1)
51- 54 F4.2 [cm/s2] logg [2.97/3.99] Log surface gravity (1)
56- 60 F5.2 [-] logRHK [-5.39/-4.67] Log(R'HK) activity index (1)
62- 65 F4.2 --- S [0.1/0.33] Mount Wilson Ca HK activity index (1)
67- 72 F6.3 m/s sigmaRV [1.944/28.302] Radial velocity rms after
removing planetary signal
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Note (1): From Brewer et al. (2016, J/ApJS/225/32).
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Star name (HD NNNNNN)
11 A1 --- m_Star [bcd] Companion identifier
12 A1 --- n_Star [*] Indicates a stellar companion rather than
a planetary companion
14- 20 F7.3 Mjup msini [0.099/838.509] Minimum mass of the planet
22- 28 F7.3 Mjup e_msini [0.006/198.555] Uncertainty in msini
30- 34 F5.3 Rjup Rad [0.564/7.815] Estimated radius (1)
36- 44 F9.3 d Per [3.415/36500] Best-fit period
46- 54 F9.3 d e_Per [0/15910] Uncertainty in Per
56- 60 F5.2 au a [0.05/22.37] Calculated semi-major axis of
the planet's orbit
62- 71 F10.2 d Tp [2.345e+06/2.46217e+06] Time of periastron
crossing
73- 80 F8.2 d e_Tp [0.05/41679.4] Uncertainty in Tp
82- 86 F5.3 --- e [0.013/0.817] Eccentricity
88- 92 F5.3 --- e_e [0.001/0.229] Uncertainty in eccentricity
94-100 F7.3 deg omega [0.372/359.833] Argument of periastron ω
102-108 F7.3 deg e_omega [0.085/201.275] Uncertainty in omega
110-116 F7.2 m/s K [4.38/9644.01] Semi-amplitude
118-123 F6.2 m/s e_K [0.4/582.27] Uncertainty in K
125-132 F8.2 m/s gamma [-2128.67/3535.91] Systemic velocity γ
134-141 F8.5 m/s dvdt [-0.02422/0.48441] Linear trend parameter
143-161 A19 --- Ref Orbital reference (2)
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Note (1): From FORECAST (Chen & Kipping 2017, J/ApJ/834/17) used for transit
calculations.
Note (2): The reference (bibcode) used as initial input orbital parameters for
the known planets. New orbital companions are listed as "This Work" if they
are planetary companions (msini<14 MJup) or "Binary" if their minimum mass
indicates they are a brown dwarf or larger mass. We have not performed an
extensive search on the previous literature of the binary companions. We have
only included those that have well-constrained orbits.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Star Star name (HD NNNNNN)
11- 19 F9.3 d JD [10283/18396.8] Date (JD-2440000)
21- 28 F8.2 m/s RV [-9770.94/8718.48] Radial velocity
30- 34 F5.2 m/s e_RV [0.5/15.3] Uncertainty in RV
36- 41 A6 --- Tel Telescope (1)
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Note (1): Telescope and source of radial velocity as follows:
AAT = Anglo-Australian Telescope (AAT), UCLES echelle spectrograph,
HD 159868: Wittenmyer et al. (2012ApJ...753..169W 2012ApJ...753..169W),
HD 181342: Wittenmyer et al. (2011AIPC.1331..117W 2011AIPC.1331..117W);
CHIRON = Cerro Tololo Inter-American Observatory, 1.5 m telescope,
CHIRON spectrograph, HD 181342: Jones et al. (2016A&A...590A..38J 2016A&A...590A..38J);
FEROS = Cerro Tololo Inter-American Observatory, 2.2 m telescope,
FEROS spectrograph, HD 181342: Jones et al. (2016A&A...590A..38J 2016A&A...590A..38J);
HET = Hobby Eberly Telescope (HET) High Resolution Spectrograph,
HD 1502: Johnson et al. (2011ApJS..197...26J 2011ApJS..197...26J),
HD 10697: Wittenmyer et al. (2009, J/ApJS/182/97);
HJS = Harlan J. Smith Telescope, Tull Coude Spectrograph,
HD 1502: Johnson et al. (2011ApJS..197...26J 2011ApJS..197...26J),
HD 10697: Wittenmyer et al. (2009, J/ApJS/182/97);
Keck = This work;
Lick = Lick Observatory, Hamilton spectrometer,
HD 192699: Johnson et al. (2007ApJ...665..785J 2007ApJ...665..785J),
HD 210702: Johnson et al. (2007ApJ...670..833J 2007ApJ...670..833J);
OAO = Okayama Astrophysical Observatory (OAO), 1.88 m telescope, HIgh
Dispersion Echelle Spectrograph (HIDES),
HD 5608 & HD 210702: Sato et al. (2012PASJ...64..135S 2012PASJ...64..135S);
SOPHIE = Observatoire de Haute-Provence, 1.93 m telescope ELODIE and
SOPHIE/SOPHIE+ instruments, HD 214823: Diaz et al. (2016,
J/A+A/585/A134);
Subaru = 8.2 m Subaru Telescope, High Dispersion Spectrograph,
HD 38801: Harakawa et al. (2010ApJ...715..550H 2010ApJ...715..550H).
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Star Star name (HD NNNNNN)
11 A1 --- f_Star [ab] Flag on Star+Companion (1)
13 A1 --- m_Star [bcd] Companion identifier
14 A1 --- n_Star [*] Indicates a stellar companion rather
than a planetary companion
16- 25 F10.2 d tau1 [2.45839e+06/2.48699e+06] First transit time
after October 1, 2018 (BJD) τ1
27- 34 F8.2 d e_tau1 [0.04/55698] Uncertainty in tau1
36- 45 F10.2 d tau2 [2.4583e+06/2.52349e+06] Second transit time
after October 1, 2018 (BJD) τ2
47- 54 F8.2 d e_tau2 [0.04/69120.4] Uncertainty in tau3
56- 65 F10.2 d tau3 [2.4584e+06/2.55999e+06] Third transit time
after October 1, 2018 (BJD) τ3
67- 74 F8.2 d e_tau3 [0.04/82553.8] Uncertainty in tau3
76- 80 F5.2 % tau-pr [0.05/69.05] Transit probability τpr
(2)
82 A1 --- f_tau-pr [b] Flag on Star+Companion transit
probability (1)
84- 92 F9.3 ppm tau-depth [193.241/23684.6] Transit depth τdepth
94-101 F8.4 h tau-dur [3.4799/266.245] Transit duration τdur
103-109 F7.4 h Dtau12 [0.1101/35.5096] Ingress/egress duration
Δτ12
111-120 A10 "date" tau1-UTC First next transit time (UTC)
122-131 A10 "date" tau2-UTC Second next transit time (UTC)
133-142 A10 "date" tau3-UTC Third next transit time (UTC)
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Note (1): A literature search for those planets with transit probabilities
greater than 10% and are known to transit or not transit are marked
accordingly:
a = Planet is known to transit;
b = Planet is known to not transit.
Note (2): The transit probabilities are calculated purely from the best-fit
radial velocity parameters.
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History:
From electronic version of the journal
References:
Johnson et al. Paper I. 2007ApJ...665..785J 2007ApJ...665..785J
Johnson et al. Paper II. 2008ApJ...675..784J 2008ApJ...675..784J
Bowler et al. Paper III. 2010ApJ...709..396B 2010ApJ...709..396B
Johnson et al. Paper IV. 2010PASP..122..701J 2010PASP..122..701J
Johnson et al. Paper VI. 2011AJ....141...16J 2011AJ....141...16J
Johnson et al. Paper VII. 2011ApJS..197...26J 2011ApJS..197...26J
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 10-Jul-2019