J/AJ/159/194 Planets around main sequence stars in GALEX UV (Viswanath+, 2020)
A statistical search for star-planet interaction in the ultraviolet using GALEX.
Viswanath G., Narang M., Manoj P., Mathew B., Kartha S.S.
<Astron. J., 159, 194 (2020)>
=2020AJ....159..194V 2020AJ....159..194V
ADC_Keywords: Exoplanets; Ultraviolet; Stars, masses; Effective temperatures
Keywords: Planetary science ; Stellar activity
Abstract:
Most (∼82%) of the over 4000 confirmed exoplanets known today orbit
very close to their host stars, within 0.5au. Planets at such small
orbital distances can result in significant interactions with their
host stars, which can induce increased activity levels in them. In
this work, we have searched for statistical evidence for star-planet
interactions in the ultraviolet (UV) using the largest sample of 1355
Galaxy Evolution Explorer (GALEX) detected host stars with confirmed
exoplanets and making use of the improved host-star parameters from
Gaia DR2. From our analysis, we do not find any significant
correlation between the UV activity of the host stars and their
planetary properties. We further compared the UV properties of planet
host stars to that of chromospherically active stars from the RAdial
Velocity Experiment (RAVE) survey. Our results indicate that the
enhancement in chromospheric activity of host stars due to star-planet
interactions may not be significant enough to reflect in their near
and far V broadband flux.
Description:
The sample used for this study is obtained from the confirmed planets
table at the NASA Exoplanet Archive (NEA), consisting of 3885 planets
and 2900 host stars (as on 2019 January 17). We cross-matched this
sample of host stars with Gaia DR2 using their coordinates in the
2015.5 epoch via the Mikulski Archive for Space Telescopes (MAST) to
retrieve accurate measurements of stellar parameters along with their
uncertainties. We used an initial search radius of 10" but the search
radius was increased to 30" for cases when a match was not found
within 10".
To find the host stars detected in UV, the resulting Gaia host stars
were then cross-matched with the final release of the Galaxy Evolution
Explorer (GALEX). We used a cross match radius of 6" and accessed the
data using the GALEX Merged Catalog. To maintain homogeneity in the
sample, we only chose sources detected in the GALEX All-Sky Imaging
Surveys (AIS).
We obtained the planetary properties of our host stars from NEA. For
those planets with data missing from the confirmed planets table at
NEA, data was taken from the composite planet data. We only retained
those sources in our sample that have the observed stellar (Teff,
Lbol, R*, parallax, M*) and planetary parameters (orbital period, MP)
with ≥3σ confidence.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 109 215 Parameters for the 215 planets around 178 main
sequence stars detected in GALEX NUV band
table2.dat 108 166 Parameters for the 166 planets around 123 main
sequence stars detected in GALEX FUV band.
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See also:
III/279 : RAVE 5th data release (Kunder+, 2017)
II/335 : Revised cat. of GALEX UV sources (GUVcat_AIS GR6+7) (Bianchi+ 2017)
I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)
I/345 : Gaia DR2 (Gaia Collaboration, 2018)
J/A+A/540/A82 : CaIIHK emission stars with close-in planets (Krejcova+, 2012)
J/ApJ/746/154 : Improved kinematic parallaxes Sco-Cen members (Pecaut+, 2012)
J/A+A/552/A119 : Planet-star and moon-planet interaction (Saur+, 2013)
J/ApJ/766/9 : GALEX observations of exoplanet host stars (Shkolnik, 2013)
J/ApJS/211/9 : Variability in UV line emission of F-M stars (Loyd+, 2014)
J/ApJ/799/163 : Chandra observations of solar analogs (Miller+, 2015)
J/ApJS/218/6 : The Spitzer Interacting Galaxies Survey (Brassington+, 2015)
J/ApJ/834/17 : Mass & radius of planets, moons, low mass stars (Chen+, 2017)
J/ApJ/835/61 : Chromospherically active stars in RAVE. II. (Zerjal+, 2017)
J/AJ/155/89 : California-Kepler Survey (CKS). IV. Planets (Petigura+, 2018)
J/AJ/158/109 : Occurrence rates of planets orbiting FGK stars (Hsu+, 2019)
http://exoplanetarchive.ipac.caltech.edu/ : NASA exoplanet archives
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/215] Sequential running number
5- 15 A11 --- Host Host star identification
17- 22 F6.1 K Teff [3873/6768] Effective temperature
24- 29 F6.2 K e_Teff [11/812] Uncertainty in Teff
31- 34 F4.2 Msun Mstar [0.55/2] Stellar mass
36- 40 F5.3 Msun e_Mstar [0.01/0.54] Uncertainty in Mstar
42- 47 F6.3 [-] Lnuv/Lbol [-4/-0.51] log, ratio, nuv to bolometric
luminosity
49- 54 F6.4 [-] e_Lnuv/Lbol [0/0.02] Uncertainty in Lnuv/Lbol (G1)
56- 68 A13 --- Planet Planet name
70- 74 F5.2 Mjup Mp [0.01/16.4] Planet mass
76- 80 F5.3 Mjup e_Mp [0/0.93] Uncertainty in Mp
82- 86 F5.3 au a [0.007/5.56] Orbital Distance
88- 93 F6.4 au e_a [0.0001/0.3] Uncertainty in a
95-109 A15 --- Method Discovery Method
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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- 3 I3 --- Seq [1/166] Sequential running number
5- 14 A10 --- Host Host star identification
16- 21 F6.1 K Teff [4044/7489] Effective temperature
23- 28 F6.2 K e_Teff [16/604] Uncertainty in Teff
30- 33 F4.2 Msun Mstar [0.58/2.65] Stellar mass
35- 39 F5.3 Msun e_Mstar [0.01/0.73] Uncertainty in Mstar
41- 46 F6.3 [-] Lfuv/Lbol [-5.7/-1.8] log, ratio, fuv to bolometric
luminosity
48- 53 F6.4 [-] e_Lfuv/Lbol [0/0.02] Uncertainty in Lfuv/Lbol (G1)
55- 66 A12 --- Planet Planet name
68- 72 F5.2 Mjup Mp [0.01/18] Planet mass
74- 78 F5.3 Mjup e_Mp [0.001/2.4] Uncertainty in Mp
80- 85 F6.3 au a [0.019/11.4] Orbital Distance
87- 92 F6.4 au e_a [0.0003/2.48] Uncertainty in a
94-108 A15 --- Method Discovery Method
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Global notes:
Note (G1): The values in this column have been rounded off to 4 decimal places.
Objects with uncertainties for logLnuv/Lbol=0.0 mean that they have
uncertainties <0.0001 on rounding off.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix, 25-May-2020