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Variable star in the constellation Lepus
AF Leporis
Location of AF Leporis (circled)
Observation data
Epoch
J2000
Equinox
J2000
Constellation
Lepus
Right ascension
05h 27m 04.76333s
[1]
Declination
−11° 54′ 03.4660″
[1]
Apparent magnitude (V)
6.26 - 6.35
[2]
Characteristics
Evolutionary stage
Main sequence
Spectral type
F8V(n)k:
[3]
Apparent magnitude (B)
6.832± 0.015
[4]
Apparent magnitude (V)
6.295± 0.010
[4]
Apparent magnitude (G)
6.209± 0.003
[1]
Apparent magnitude (J)
5.268± 0.027
[4]
Apparent magnitude (H)
5.087± 0.026
[4]
Apparent magnitude (K)
4.926± 0.021
[4]
Variable type
RS CVn
[2]
Astrometry
Radial velocity (Rv ) 21.10± 0.37
[1] km/s
Proper motion (μ)
RA: 16.915
mas /
yr
[1]
Dec.: −49.318
mas /
yr
[1]
Parallax (π) 37.2539 ± 0.0195
mas
[1]
Distance 87.55 ± 0.05
ly (26.84 ± 0.01
pc )
Absolute magnitude (MV ) 4.14
[5]
Details
Mass 1.09± 0.06
[6]
M ☉
Radius 1.25± 0.06
[7]
R ☉ Luminosity (bolometric) 1.84± 0.01
[8]
L ☉
Surface gravity (log g ) 4.30± 0.05
[6]
cgs
Temperature 6130± 60
[7]
K
Metallicity [Fe/H] +0.19± 0.02
[7]
dex
Rotation 0.9660± 0.0023
d
[9]
Rotational velocity (v sin i ) 50± 5
[7] km/s
Age 24± 3
[7]
Myr
Other designations
AF Lep ,
NSV 16310,
BD −12 1169 ,
FK5 2409,
HD 35850,
HIP 25486,
HR 1817,
SAO 150461,
PPM 215789,
TIC 94945758 ,
TYC 5340-1141-1 ,
GCRV 3284 ,
GSC 05340-01141 ,
IRAS 05247-1156
[10]
Database references
SIMBAD
data
AF Leporis , also known as HD 35850 , is an
F-type main-sequence star located 87.5
light-years (26.8
parsecs ) away from the
Solar System in the constellation of
Lepus . With an
apparent magnitude of 6.3, it is near the limit of
naked eye visibility under ideal conditions. While some studies consider it to be a close
spectroscopic binary with a separation of 0.021
AU ,
[8] other studies show no evidence of binarity, and it is likely that the supposed binarity is an artifact resulting from the presence of
starspots .
[9]
[4]
A
light curve for AF Leporis, plotted from
TESS data
[11]
AF Leporis is a member of the
Beta Pictoris moving group , with an astronomically young age of about 24 million years. It hosts a
circumstellar disk and one known
exoplanet .
[7]
Planetary system
Two images of AF Lep b with the SPHERE instrument on the Very Large Telescope
[12]
In 2023, a
gas giant exoplanet, AF Leporis b, was discovered in orbit around AF Leporis by
direct imaging using the NIRC2 instrument at the
W. M. Keck Observatory and the
SPHERE instrument at the
Very Large Telescope . It was also detected in
astrometric data from the
Hipparcos and
Gaia spacecraft, allowing an accurate measurement of its mass.
[7]
[4]
[13] AF Leporis b was later
precovered in imaging data from 2011, allowing a more accurate determination of its orbit.
[14]
There have been multiple studies of AF Leporis b, which have found somewhat different parameters. Dynamical mass measurements range from 2.8
M J
[6] to 5.5 M J .
[4] Values for the planet's
orbital inclination range from 50°+9° −12°
[7] to ~98° ,
[13] the former consistent with the stellar inclination of 54°+11° −9° and suggesting an aligned system.
[7] Initial studies found a fairly
eccentric orbit for the planet, but the precovery observations show that its orbit is nearly circular.
[14]
AF Leporis b has an
effective temperature of about 750
K (477
°C ; 890
°F ), corresponding to an
early-T spectral type.
[15] Spectroscopic evidence suggests that it has a
metal-rich atmosphere with
silicate clouds,
[6] though further studies are needed to confirm this.
[15]
See also
References
^
a
b
c
d
e
f Vallenari, A.; et al. (Gaia collaboration) (2023).
"Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1.
arXiv :
2208.00211 .
Bibcode :
2023A&A...674A...1G .
doi :
10.1051/0004-6361/202243940 .
S2CID
244398875 .
Gaia DR3 record for this source at
VizieR .
^
a
b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S . 1 : B/gcvs.
Bibcode :
2009yCat....102025S .
^ Gray, R. O.; Corbally, C. J.; 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
250741593 .
^
a
b
c
d
e
f
g
h Mesa, D.; Gratton, R.; et al. (February 2023). "AF Lep b: the lowest mass planet detected coupling astrometric and direct imaging data".
Astronomy & Astrophysics . 672 : A93.
arXiv :
2302.06213 .
Bibcode :
2023A&A...672A..93M .
doi :
10.1051/0004-6361/202345865 .
S2CID
256827302 .
^ 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
c
d
e
f Zhang, Zhoujian; Mollière, Paul; et al. (September 2023).
"ELemental abundances of Planets and brown dwarfs Imaged around Stars (ELPIS): I. Potential Metal Enrichment of the Exoplanet AF Lep b and a Novel Retrieval Approach for Cloudy Self-luminous Atmospheres" .
The Astronomical Journal . 166 (5): 198.
arXiv :
2309.02488 .
Bibcode :
2023AJ....166..198Z .
doi :
10.3847/1538-3881/acf768 .
^
a
b
c
d
e
f
g
h
i Franson, Kyle; Bowler, Brendan P.; et al. (February 2023).
"Astrometric Accelerations as Dynamical Beacons: A Giant Planet Imaged Inside the Debris Disk of the Young Star AF Lep" .
The Astrophysical Journal Letters . 950 (2): L19.
arXiv :
2302.05420 .
Bibcode :
2023ApJ...950L..19F .
doi :
10.3847/2041-8213/acd6f6 .
^
a
b Pawellek, Nicole; Wyatt, Mark; et al. (April 2021). "A ~75 per cent occurrence rate of debris discs around F stars in the β Pic moving group".
Monthly Notices of the Royal Astronomical Society . 502 (4): 5390–5416.
arXiv :
2101.12049 .
Bibcode :
2021MNRAS.502.5390P .
doi :
10.1093/mnras/stab269 .
^
a
b Järvinen, S. P.; Arlt, R.; et al. (February 2015). "Doppler images and the underlying dynamo. The case of AF Leporis".
Astronomy & Astrophysics . 574 : A25.
arXiv :
1412.2892 .
Bibcode :
2015A&A...574A..25J .
doi :
10.1051/0004-6361/201424229 .
S2CID
119205096 .
^
"V* AF Lep" .
SIMBAD .
Centre de données astronomiques de Strasbourg . Retrieved 16 February 2023 .
^
"MAST: Barbara A. Mikulski Archive for Space Telescopes" . Space Telescope Science Institute. Retrieved 8 December 2021 .
^
"Spotting a hidden exoplanet" .
ESO . 20 February 2023.
^
a
b De Rosa, Robert J.; Nielsen, Eric L.; et al. (February 2023). "Direct imaging discovery of a super-Jovian around the young Sun-like star AF Leporis".
Astronomy & Astrophysics . 672 : A94.
arXiv :
2302.06332 .
Bibcode :
2023A&A...672A..94D .
doi :
10.1051/0004-6361/202345877 .
S2CID
256827414 .
^
a
b
c Bonse, Markus J.; Gebhard, Timothy D.; et al. (June 2024). "Use the 4S (Signal-Safe Speckle Subtraction): Explainable Machine Learning reveals the Giant Exoplanet AF Lep b in High-Contrast Imaging Data from 2011".
arXiv :
2406.01809 [
astro-ph.EP ].
^
a
b Palma-Bifani, P.; Chauvin, G.; et al. (March 2024). "Atmospheric properties of AF Lep b with forward modeling".
Astronomy & Astrophysics . 683 : A214.
arXiv :
2401.05491 .
Bibcode :
2024A&A...683A.214P .
doi :
10.1051/0004-6361/202347653 .
^ Pearce, Tim D.; Launhardt, Ralf; et al. (March 2022). "Planet populations inferred from debris discs. Insights from 178 debris systems in the ISPY, LEECH, and LIStEN planet-hunting surveys".
Astronomy & Astrophysics . 659 : A135.
arXiv :
2201.08369 .
Bibcode :
2022A&A...659A.135P .
doi :
10.1051/0004-6361/202142720 .
S2CID
246063879 .