J/ApJ/830/46 Radial velocities of 3 Neptune-mass planet hosts (Fulton+, 2016)
Three temperate neptunes orbiting nearby stars.
Fulton B.J., Howard A.W., Weiss L.M., Sinukoff E., Petigura E.A.,
Isaacson H., Hirsch L., Marcy G.W., Henry G.W., Grunblatt S.K., Huber D.,
von Braun K., Boyajian T.S., Kane S. R., Wittrock J., Horch E.P.,
Ciardi D.R., Howell S.B., Wright J.T., Ford E.B.
<Astrophys. J., 830, 46-46 (2016)>
=2016ApJ...830...46F 2016ApJ...830...46F (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Radial velocities ; Planets
Keywords: planetary systems; stars: individual: (HD 42618, HD 164922, HD 143761)
Abstract:
We present the discovery of three modestly irradiated, roughly
Neptune-mass planets orbiting three nearby Solar-type stars. HD42618b
has a minimum mass of 15.4±2.4 M⊕, a semimajor axis of
0.55au, an equilibrium temperature of 337K, and is the first planet
discovered to orbit the solar analogue host star, HD42618. We also
discover new planets orbiting the known exoplanet host stars HD164922
and HD143761 (ρ CrB). The new planet orbiting HD164922 has a
minimum mass of 12.9±1.6 M⊕ and orbits interior to the
previously known Jovian mass planet orbiting at 2.1au. HD164922c has a
semimajor axis of 0.34au and an equilibrium temperature of 418K.
HD143761c orbits with a semimajor axis of 0.44au, has a minimum mass
of 25±2 M⊕, and is the warmest of the three new planets with
an equilibrium temperature of 445K. It orbits exterior to the
previously known warm Jupiter in the system. A transit search using
space-based CoRoT data and ground-based photometry from the Automated
Photometric Telescopes (APTs) at Fairborn Observatory failed to detect
any transits, but the precise, high-cadence APT photometry helped to
disentangle planetary-reflex motion from stellar activity. These
planets were discovered as part of an ongoing radial velocity survey
of bright, nearby, chromospherically inactive stars using the
Automated Planet Finder (APF) telescope at Lick Observatory. The
high-cadence APF data combined with nearly two decades of radial
velocity data from Keck Observatory and gives unprecedented
sensitivity to both short-period low-mass, and long-period
intermediate-mass planets.
Description:
We collected 571 radial velocity (RV) measurements of HD 42618 using
Keck/HIRES and 35 measurements using the Levy spectrograph on the
Automated Planet Finder (APF) over the past 19 years starting in 1996.
Our setup was identical for the three stars. We collected 328
Keck/HIRES measurements and 73 APF measurements for HD 164922 over the
past 19 years. All of the APF measurements and 244 of the Keck
measurements are new since the publication of Butler+ (2006,
J/ApJ/646/505).
For HD 143761 we obtained 519 RV measurements using Keck/HIRES and 157
measurements using the Levy spectrograph on the APF. The Keck
observations of HD 143761 started in 2006 and the total observational
baseline is 8 years.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 41 1682 Radial velocities of the three nearby solar-type
stars
table2.dat 203 3 Adopted stellar properties and orbital periods
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See also:
J/ApJ/805/175 : Keck and APF radial velocities of HD7924 (Fulton+, 2015)
J/ApJS/210/5 : The twenty-five year Lick planet search (Fischer+, 2014)
J/ApJ/772/80 : Radial velocities of HAT-P-17 (Fulton+, 2013)
J/ApJ/770/69 : Kepler planet candidates radii (Petigura+, 2013)
J/MNRAS/420/L23 : Non-resonant Kepler planetary systems (Veras+, 2012)
J/ApJ/756/46 : Lithium abundances in HIP stars (Ramirez+, 2012)
J/ApJ/745/24 : A search for new companions with CHARA (Raghavan+, 2012)
J/ApJ/733/68 : Exoplanet masses derived from RVs (Brown+, 2011)
J/AJ/142/19 : Speckle observations of KOI (Howell+, 2011)
J/AJ/141/45 : Speckel observations of HIP stars (Horch+, 2011)
J/ApJ/725/875 : Chromospheric activity for CPS stars (Isaacson+, 2010)
J/other/Sci/330.653 : Detected planets in the Eta-Earth Survey (Howard+, 2010)
J/ApJ/720/1290 : Abundances of stars hosting planets (Ghezzi+, 2010)
J/AJ/138/312 : Activity of bright solar analogs (Hall+, 2009)
J/ApJ/694/1085 : Radii of exoplanet host stars (van Belle+, 2009)
J/ApJ/680/728 : Diameters of exoplanet host stars (Baines+, 2008)
J/ApJ/649/1010 : Habitability of known exoplanetary systems (Jones+, 2006)
J/ApJ/646/505 : Catalog of nearby exoplanets (Butler+, 2006)
J/ApJ/457/L99 : 25yr CaII-HK obs. of F-K nearby stars (Baliunas+, 1996)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD identifier
8- 21 F14.6 d BJD Barycentric Julian Date (TDB)
23- 28 F6.2 m/s RVel [-78.1/74.6] Radial velocity (1)
30- 33 F4.2 m/s e_RVel [0.8/5.1] Uncertainty in RVel
35 A1 --- Inst Instrument code (2)
37- 41 F5.3 --- SHK [0.04/0.2]? Calcium H&K activity index (3)
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Note (1): Zero point offsets between instruments have not been removed and must
be fit as free parameters when analyzing this dataset.
Note (2): Instrument code as follows:
k = pre-upgrade Keck/HIRES;
j = post-upgrade Keck/HIRES;
a = Automated Planet Finder (APF).
Note (3): Uncertainties are 0.002 for all Keck measurements
and 0.004 for all APF measurements.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 2 A2 --- --- [HD]
4- 9 I6 --- HD HD identifier
11- 13 A3 --- SpT MK spectral type
15 I1 --- r_SpT [1/8] Reference for SpT (1)
17- 21 F5.3 mag B-V [0.6/0.8] (B-V) color index
23 I1 --- r_B-V [2/7]? Reference for B-V (1)
25- 29 F5.3 mag Vmag [5.4/7] V-band magnitude
31 I1 --- r_Vmag [2/8] Reference for Vmag (1)
33- 37 F5.3 mag Jmag [4/5.8] 2MASS J-band magnitude
39- 43 F5.3 mag e_Jmag [0.02/0.03]? Jmag uncertainty
45- 49 F5.3 mag Hmag [3.9/5.4] 2MASS H-band magnitude
51- 55 F5.3 mag e_Hmag [0.01/0.03]? Hmag uncertainty
57- 61 F5.3 mag Kmag [3.8/5.4] K-band magnitude
63- 67 F5.3 mag e_Kmag [0.02/0.05] Kmag uncertainty
69 I1 --- r_Kmag [3/8] Reference for Kmag (1)
71- 76 F6.3 pc Dist [17.2/23.5] Distance from Hipparcos (I/311)
78- 82 F5.3 pc e_Dist [0.02/0.3] Dist uncertainty
84- 87 I4 K Teff [5293/5727] Effective temperature
89- 90 I2 K e_Teff [32/60] Teff uncertainty
92- 93 I2 --- r_Teff [11]? Reference for Teff (1)
95- 99 F5.3 [cm/s2] logg [4.1/4.5] Log of surface gravity
101-105 F5.3 [cm/s2] e_logg [0.01/0.07] logg uncertainty
107-111 F5.2 [Sun] [Fe/H] [-0.4/0.2] Metallicity
113-116 F4.2 [Sun] e_[Fe/H] [0.04/0.05] [fe/H] uncertainty
118-119 A2 --- l_vsini [≤] Limit flag on vsini
120 I1 km/s vsini [2] Rotational velocity
122-126 F5.3 Lsun L* [0.7/1.8] Luminosity
128-132 F5.3 Lsun e_L* [0.01/0.2] L* uncertainty
134-135 I2 --- r_L* [11]? Reference for L* (1)
137-141 F5.3 Msun M* [0.8/1.1] Mass
143-147 F5.3 Msun e_M* [0.01/0.07] M* uncertainty
149-150 I2 --- r_M* [12]? Reference for M* (1)
152-157 F6.4 Rsun R* [0.9/1.4] Radius
159-164 F6.4 Rsun e_R* [0.01/0.09] R* uncertainty
166-167 I2 --- r_R* [11/12]? Reference for R* (1)
169-173 F5.2 --- logRHK [-5.1/-5] log R'HK value from
Isaacson & Fischer, 2010, J/ApJ/725/875
175-179 F5.3 --- SHK [0.1/0.2] SHK value from
Isaacson & Fischer, 2010, J/ApJ/725/875
181-189 F9.4 d Pb Orbital period; column added by CDS from
tables 3, 4 and 5
191-196 F6.4 d E_Pb Positive error on Pb
198-203 F6.4 d e_Pb Negative error on Pb
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Note (1): Reference as follows:
1 = Medhi et al. (2007, J/A+A/469/713)
2 = Koen et al. (2010, J/MNRAS/403/1949)
3 = Cutri et al. (2003, II/246; 2MASS)
6 = Gray et al. (2003, J/AJ/126/2048)
7 = Butler et al. (2006, J/ApJ/646/505)
8 = van Belle & von Braun (2009, J/ApJ/694/1085)
9 = Noyes et al. (1997ApJ...483L.111N 1997ApJ...483L.111N)
10 = van Belle & von Braun (2009, J/ApJ/694/1085)
11 = von Braun et al. (2014MNRAS.438.2413V 2014MNRAS.438.2413V)
12 = Torres et al. (2010, J/other/A+ARV/18.67)
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 17-Jan-2017