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Red dwarf star in the constellation Scorpius
HIP 79431 is a
red dwarf
star with a planetary companion in the
constellation
Scorpius . It has the proper name Sharjah , as selected in the
NameExoWorlds campaign by
United Arab Emirates , during the 100th anniversary of the
IAU .
Sharjah is the cultural capital of United Arab Emirates.
[11]
[12] The star has an
apparent visual magnitude of 11.34,
[2] which is far too faint to be visible to the naked eye. Based on
parallax measurements, this system is located at a distance of 47.4
light-years from the
Sun . It is drifting closer with a
radial velocity of −5 km/s.
[4]
This is an
M-type main-sequence star with a
stellar classification of M3V.
[3] This star is smaller, cooler, dimmer, and less massive than the Sun, but the estimated
metal content is 2.5 times as much as the Sun. The level of
chromospheric activity does not appear to be unusually high for a star of this class.
[9]
In 2010, a
superjovian
exoplanetary companion was discovered using the
radial-velocity method . It is orbiting at a distance of 0.36
AU from the hos star with a
period of 0.3 years and an
eccentricity (ovalness) of 0.29. Since the
inclination of the orbit is unknown, only a lower bound on the mass can be determined. It has at least 2.1 times the
mass of Jupiter .
[5]
See also
References
^
a
b
c
d
Brown, A. G. A. ; et al. (Gaia collaboration) (August 2018).
"Gaia Data Release 2: Summary of the contents and survey properties" .
Astronomy & Astrophysics . 616 . A1.
arXiv :
1804.09365 .
Bibcode :
2018A&A...616A...1G .
doi :
10.1051/0004-6361/201833051 .
Gaia DR2 record for this source at
VizieR .
^
a
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c
d
e
f
g
h
i
j
k
l Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331.
arXiv :
1108.4971 .
Bibcode :
2012AstL...38..331A .
doi :
10.1134/S1063773712050015 .
S2CID
119257644 .
^
a
b Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal . 132 (1): 161–170.
arXiv :
astro-ph/0603770 .
Bibcode :
2006AJ....132..161G .
doi :
10.1086/504637 .
S2CID
119476992 .
^
a
b Terrien, Ryan C.; et al. (March 2015). "M Dwarf Luminosity, Radius, and α-enrichment from I-band Spectral Features". The Astrophysical Journal Letters . 802 (1): 6.
arXiv :
1503.01776 .
Bibcode :
2015ApJ...802L..10T .
doi :
10.1088/2041-8205/802/1/L10 .
S2CID
118497562 . L10.
^
a
b
c Apps, Kevin; et al. (2010).
"M2K: I. A Jupiter-Mass Planet Orbiting the M3V Star HIP 79431" .
Publications of the Astronomical Society of the Pacific . 122 (888): 156–161.
arXiv :
1001.1174 .
Bibcode :
2010PASP..122..156A .
doi :
10.1086/651058 .
S2CID
119186731 .
^
a
b
c Doyle, L.; et al. (October 2018). "Investigating the rotational phase of stellar flares on M dwarfs using K2 short cadence data". Monthly Notices of the Royal Astronomical Society . 480 (2): 2153–2164.
arXiv :
1807.08592 .
Bibcode :
2018MNRAS.480.2153D .
doi :
10.1093/mnras/sty1963 .
^
a
b
c Tsuji, Takashi; Nakajima, Tadashi (October 2014). "Near-infrared spectroscopy of M dwarfs. I. CO molecule as an abundance indicator of carbon†". Publications of the Astronomical Society of Japan . 66 (5): 26.
arXiv :
1407.5829 .
Bibcode :
2014PASJ...66...98T .
doi :
10.1093/pasj/psu078 . 98.
^ Stassun, Keivan G.; et al. (2016).
"Accurate Empirical Radii and Masses of Planets and Their Host Stars with Gaia Parallaxes" . The Astronomical Journal . 153 (3): 136.
arXiv :
1609.04389 .
Bibcode :
2017AJ....153..136S .
doi :
10.3847/1538-3881/aa5df3 .
S2CID
119219062 .
^
a
b
c Rojas-Ayala, Bárbara; et al. (April 2012), "Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs", The Astrophysical Journal , 748 (2): 93,
arXiv :
1112.4567 ,
Bibcode :
2012ApJ...748...93R ,
doi :
10.1088/0004-637X/748/2/93 ,
S2CID
41902340
^
"LP 804-27" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 2021-11-13 .
^
"Approved names" . NameExoworlds . Retrieved 2020-01-02 .
^
"International Astronomical Union | IAU" . www.iau.org . Retrieved 2020-01-02 .