LTT 3780

LTT 3780, also known as TOI-732 or LP 729-54, is the primary of the binary stellar system LDS 3977 in the constellation Hydra.

LTT 3780
Observation data
Epoch J2000      Equinox J2000
Constellation Hydra
Right ascension 10h 18m 35.137s
Declination −11° 43 0.242
Apparent magnitude (V) 13.14
Characteristics
Spectral type M4V
Apparent magnitude (b) 14.678
Apparent magnitude (g) 11.8465
Apparent magnitude (j) 9.007
Astrometry
Proper motion (μ) RA: -341.409 mas/yr
Dec.: -247.870 mas/yr
Parallax (π)45.4644 ± 0.0827 mas[1]
Distance71.7 ± 0.1 ly
(22.00 ± 0.04 pc)
Absolute magnitude (MV)11.43
Details
Mass0.401 M
Radius0.374 R
Surface gravity (log g)4.896 cgs
Temperature3331 K
Metallicity [Fe/H]0.28 dex
Rotational velocity (v sin i)1.3 km/s
Age5 Gyr
Other designations
G 162-44, LP 729-54, LTT 3780, 2MASS J10183516-1142599
Database references
SIMBADdata

Characteristics

LTT 3780 is an M-type main-sequence star. It is of similar age to Sun and relatively enriched in metals.

Planetary system

In 2020, an analysis carried out by a team of astronomers led by astronomer Ryan Cloutier of the TESS project confirmed the existence of two planets on mildly eccentric orbits, the inner being a super-Earth and the outer a small gas giant about half the mass of Uranus.

The LTT 3780 planetary system[2][3]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 2.34+0.24
−0.23
 M🜨
0.01203+0.00054
−0.00053
0.77±0.001 0.064+0.075
−0.046
85.9° 1.35±0.06 R🜨
c 6.29+0.63
−0.61
 M🜨
0.0762±0.0034 12.252131+0.000072
−0.000064
0.115+0.07
−0.065
89.08° 2.42±0.1 R🜨

See also

References

  1. 162-44 G 162-44, entry, SIMBAD. Accessed March 6, 2020.
  2. Cloutier, Ryan; Eastman, Jason D.; Rodriguez, Joseph E.; Astudillo-Defru, Nicola; Bonfils, Xavier; Mortier, Annelies; Watson, Christopher A.; Stalport, Manu; Pinamonti, Matteo; Lienhard, Florian; Harutyunyan, Avet; Damasso, Mario; Latham, David W.; Collins, Karen A.; Massey, Robert; Irwin, Jonathan; Winters, Jennifer G.; Charbonneau, David; Ziegler, Carl; Matthews, Elisabeth; Crossfield, Ian J. M.; Kreidberg, Laura; Quinn, Samuel N.; Ricker, George; Vanderspek, Roland; Seager, Sara; Winn, Joshua; Jenkins, Jon M.; Vezie, Michael; et al. (2020). "A pair of TESS planets spanning the radius valley around the nearby mid-M dwarf LTT 3780". The Astronomical Journal. 160 (1): 3. arXiv:2003.01136. Bibcode:2020AJ....160....3C. doi:10.3847/1538-3881/ab91c2. S2CID 211817805.
  3. Nowak, G.; Luque, R.; Parviainen, H.; Pallé, E.; Molaverdikhani, K.; Béjar, V. J. S.; Lillo-Box, J.; Rodríguez-López, C.; Caballero, J. A.; Zechmeister, M.; Passegger, V. M.; Cifuentes, C.; Schweitzer, A.; Narita, N.; Cale, B.; Espinoza, N.; Murgas, F.; Zapatero Osorio, M. R.; Pozuelos, F. J.; Aceituno, F. J.; Amado, P. J.; Barkaoui, K.; Barrado, D.; Bauer, F. F.; Benkhaldoun, Z.; Caldwell, D. A.; Casasayas Barris, N.; Chaturvedi, P.; Chen, G.; et al. (2020). "The CARMENES search for exoplanets around M dwarfs. Two planets on the opposite sides of the radius gap transiting the nearby M dwarf LP 729-54". Astronomy & Astrophysics. A173: 642. arXiv:2003.01140. doi:10.1051/0004-6361/202037867. S2CID 211818198.
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