J/A+A/648/A58 Radial velocity curves of 4 stars (Niedzielski+, 2021)
Tracking Advanced Planetary Systems (TAPAS) with HARPS-N.
VII. Elder suns with low-mass companions.
Niedzielski A., Villaver E., Adamow M., Kowalik K., Wolszczan A.,
Maciejewski G.
<Astron. Astrophys. 648, A58 (2021)>
=2021A&A...648A..58N 2021A&A...648A..58N (SIMBAD/NED BibCode)
ADC_Keywords: Stars, late-type ; Radial velocities
Keywords: planetary systems - planets and satellites: detection -
Abstract:
We present the current status of and new results from our search for
exoplanets in a sample of solar-mass evolved stars observed with the
HARPS-N and the 3.6m Telescopio Nazionale Galileo (TNG), and the
High-Resolution Spectrograph (HRS) and the 9.2m Hobby-Eberly
Telescope (HET).
The aim of this project is to detect and characterize planetary-mass
companions to solar-mass stars in a sample of 122 targets at various
stages of evolution from the main sequence (MS) to the red giant
branch (RGB), mostly subgiants and giants, selected from the
Pennsylvania-Torun Planet Search (PTPS) sample, and to use this
sample to study relations between stellar properties, such as
metallicity, luminosity, and the planet occurrence rate.
This work is based on precise radial velocity (RV) measurements. We
have observed the program stars for up to 14 years with the HET/HRS
and the TNG/HARPS-N.
We present the analysis of RV measurements with the HET/HRS and the
TNG/HARPS-N of four solar-mass stars, HD 4760, HD 96992 , BD+02 3313,
and TYC 0434-04538-1. We found that HD 4760 hosts a companion with a
minimum mass of 13.9MJ) (a=1.14au, e=0.23); HD 96992 is a host to
a msini=1.14MJ companion on an a=1.24au and e=0/41 orbit, and
TYC 0434-04538-1 hosts an msini=6.1MJ companion on an a=0.66au
and e=0.08 orbit. In the case of BD+02 3313 we found a correlation
between the measured RVs and one of the stellar activity indicators,
suggesting that the observed RV variations may either originate in
stellar activity or be caused by the presence of an unresolved
companion. We also discuss the current status of the project and a
statistical analysis of the RV variations in our sample of target
stars.
In our sample of 122 solar-mass stars, 49±5% of them appear to be
single and 16±3% spectroscopic binaries. The three giants hosting
low-mass companions presented in this paper join the six previously
identified giants in the sample.
Description:
There are 133 stars in the PTPS sample with masses in the
1±0.05M☉ range: 12 dwarfs, 39 subgiants, and 82 giants
(Deka-Szymankiewicz et al. 2018A&A...615A..31D 2018A&A...615A..31D, Cat. J/A+A/615/A31
and references therein).
Here we present the results for four stars from this sample that show
RV variations appearing to be caused by low-mass companions.
The spectroscopic observations presented in this paper were made with
two instruments: the 9.2m Hobby-Eberly Telescope (HET) and its
High-Resolution Spectrograph (HRS) in the queue scheduling mode, and
the 3.58m Telescopio Nazionale Galileo (TNG) and its High Accuracy
Radial velocity Planet Searcher in the Northern hemisphere (HARPS-N).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 131 4 Basic parameters of the program stars
table2.dat 65 169 RV data for program stars
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See also:
J/A+A/615/A31 : PTPS stars IV. (Deka-Szymankiewicz+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 16 A16 --- Name Star name
18- 19 I2 h RAh Right ascension (J2000)
21- 22 I2 min RAm Right ascension (J2000)
24- 28 F5.2 s RAs Right ascension (J2000)
30 A1 --- DE- Declination sign (J2000)
31- 32 I2 deg DEd Declination (J2000)
34- 35 I2 arcmin DEm Declination (J2000)
37- 40 F4.1 arcsec DEs Declination (J2000)
42- 45 I4 K Teff Effective temperature
47- 48 I2 K e_Teff rms uncertainty on Teff
50- 53 F4.2 [cm/s2] logg Surface gravity
55- 58 F4.2 [cm/s2] e_logg rms uncertainty on logg
60- 64 F5.2 [-] [Fe/H] Metalicity
66- 69 F4.2 [-] e_[Fe/H] rms uncertainty on [Fe/H]
71- 74 F4.2 [Lsun] logL Luminosity
76- 79 F4.2 [Lsun] e_logL rms uncertainty on logL
81- 84 F4.2 Msun Mass Mass
86- 89 F4.2 Msun e_Mass rms uncertainty on Mass
91- 95 F5.2 Rsun Rad Radius
97-100 F4.2 Rsun e_Rad rms uncertainty on Rad
102-105 F4.2 km/s vsini Rotational velocity
107-110 F4.2 km/s e_vsini rms uncertainty on vsini
112-115 I4 d Prot Rotational period
117-120 I4 d e_Prot rms uncertainty on Prot
122-127 F6.1 d Per Period of companion (from table 3)
129-131 F3.1 d e_Per rms uncertainty on Per (from table 3)
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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- 16 A16 --- Name Star name
19- 21 A3 --- Inst [HET TNG] Instrument
23- 36 F14.6 d JD Julian date
38- 46 F9.2 m/s RV Radial velocity
48- 52 F5.2 m/s e_RV rms uncertainty on RV
54- 59 F6.2 m/s BIS Bisector span
61- 65 F5.2 m/s e_BIS ? rms uncertainty on BIS
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Acknowledgements:
Andrzej Niedzielski, Andrzej.Niedzielski(at)umk.pl
(End) Patricia Vannier [CDS] 01-Apr-2021