HD 17156

Last updated
HD 17156 / Nushagak
Observation data
Epoch J2000       Equinox J2000
Constellation Cassiopeia [1]
Right ascension 02h 49m 44.48710s [2]
Declination +71° 45′ 11.6292″ [2]
Apparent magnitude  (V)8.16 [3]
Characteristics
Evolutionary stage main sequence [2]
Spectral type F9V [4]
Astrometry
Radial velocity (Rv)−3.29±0.13 [2] km/s
Proper motion (μ)RA: +90.848 [2] mas/yr
Dec.: −33.013 [2] mas/yr
Parallax (π)12.9142±0.0177  mas [2]
Distance 252.6 ± 0.3  ly
(77.4 ± 0.1  pc)
Absolute magnitude  (MV)3.80 [1]
Details
Mass 1.275±0.018 [5]   M☉
Radius 1.5007±0.0076 [5]   R☉
Luminosity 2.76+0.19
−0.13 [6]   L☉
Surface gravity (log g)4.184±0.024 [6]   cgs
Temperature 6,046+76
−72 [6]   K
Metallicity [Fe/H]+0.208±0.058 [6]   dex
Rotation ~12.8 d [7]
Rotational velocity (v sin i)2.8±0.5 [8]  km/s
Age 3.37+0.20
−0.47 [5]   Gyr
Other designations
Nushagak, AG+71 95, BD+71 171, HD 17156, HIP 13192, SAO 4737, PPM 5099, TOI-1573, TIC 302773669, TYC 4321-1320-1, GSC 04321-01320 [9]
Database references
SIMBAD data
Exoplanet Archive data

HD 17156, named Nushagak by the IAU, [10] is a yellow subgiant star approximately 253 light-years away in the constellation of Cassiopeia. The apparent magnitude is 8.16, which means it is not visible to the naked eye but can be seen with good binoculars. [9] It hosts one known exoplanet, HD 17156 b. A search for a binary companion star using adaptive optics at the MMT Observatory was negative. [11]

Contents

Nomenclature

The designation HD 17156 comes from the Henry Draper Catalogue.

This was one of the systems selected to be named in the 2019 NameExoWorlds campaign during the 100th anniversary of the IAU, which assigned each country a star and planet to be named. This system was assigned to the United States. The star was given the name Nushagak, with the comment that "Nushagak is a regional river near Dillingham, Alaska, which is famous for its wild salmon that sustain local Indigenous communities." [10] The planet HD 17156 b was given the name Mulchatna, after a tributary of the Nushagak river.

Stellar properties

The star is more massive and larger than the Sun, while its absolute magnitude of 3.70 and spectral type of G0 show that it is both hotter and more luminous. Based on asteroseismic density constraints and stellar isochrones, it was found that the age is 3.37 +0.20
−0.47 billion years making it about two thirds as old as the Sun. Spectral observations show that the star is metal-rich. [7] [5]

Planetary system

An exoplanet, HD 17156 b (later named Mulchatna), was discovered with the radial velocity method in 2007, [7] and subsequently was observed to transit the star. At the time it was the transiting planet with the longest period. [12] It is a gas giant more massive than Jupiter with a close-in, eccentric orbit. [12] HD 17156 is the first star in Cassiopeia around which an orbiting planet was discovered.[ citation needed ]

Observations have ruled out the presence of any additional Jupiter-mass planets within 10 AU of the star. [6]

The HD 17156 planetary system [6]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Mulchatna 3.26±0.11  MJ 0.1632±0.002721.2164294(61)0.6772+0.0045
−0.0044		86.51+0.37
−0.34 ° 		1.094+0.031
−0.030  RJ

See also

References

  1. 1 2 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.
  2. 1 2 3 4 5 6 7 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.
  3. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355. Bibcode:2000A&A...355L..27H.
  4. ↑ Grieves, N.; Ge, J.; Thomas, N.; Willis, K.; Ma, B.; Lorenzo-Oliveira, D.; Queiroz, A. B. A.; Ghezzi, L.; Chiappini, C.; Anders, F.; Dutra-Ferreira, L.; Porto De Mello, G. F.; Santiago, B. X.; Da Costa, L. N.; Ogando, R. L. C.; Del Peloso, E. F.; Tan, J. C.; Schneider, D. P.; Pepper, J.; Stassun, K. G.; Zhao, B.; Bizyaev, D.; Pan, K. (2018). "Chemo-kinematics of the Milky Way from the SDSS-III MARVELS survey". Monthly Notices of the Royal Astronomical Society. 481 (3): 3244. arXiv: 1803.11538 . Bibcode:2018MNRAS.481.3244G. doi: 10.1093/mnras/sty2431 .
  5. 1 2 3 4 Nutzman, Philip; et al. (2011). "Precise Estimates of the Physical Parameters for the Exoplanet System HD 17156 Enabled by Hubble Space Telescope Fine Guidance Sensor Transit and Asteroseismic Observations". The Astrophysical Journal. 726 (1). 3. arXiv: 1011.0440 . Bibcode:2011ApJ...726....3N. doi:10.1088/0004-637X/726/1/3. S2CID   118003582.
  6. 1 2 3 4 5 6 Kane, Stephen R.; Hill, Michelle L.; et al. (June 2023). "Revised Properties and Dynamical History for the HD 17156 System". The Astronomical Journal . 165 (6): 252. arXiv: 2305.01000 . Bibcode:2023AJ....165..252K. doi: 10.3847/1538-3881/acd17a .
  7. 1 2 3 Fischer, Debra A.; et al. (2007). "Five Intermediate-Period Planets from the N2K Sample". The Astrophysical Journal. 669 (2): 1336–1344. arXiv: 0704.1191 . Bibcode:2007ApJ...669.1336F. doi:10.1086/521869. S2CID   7774321.
  8. ↑ Bonomo, A. S.; et al. (2017). "The GAPS Programme with HARPS-N at TNG . XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy and Astrophysics. 602. A107. arXiv: 1704.00373 . Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882. S2CID   118923163.
  9. 1 2 "HD 17156". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2009-05-20.
  10. 1 2 "Approved names (§ United States of America)". Name Exo Worlds. IAU . Retrieved 19 December 2019.
  11. ↑ Adams, E. R.; et al. (2013). "Adaptive Optics Images. II. 12 Kepler Objects of Interest and 15 Confirmed Transiting Planets". The Astronomical Journal. 146 (1). 9. arXiv: 1305.6548 . Bibcode:2013AJ....146....9A. doi:10.1088/0004-6256/146/1/9. S2CID   119117620.
  12. 1 2 Barbieri, M.; et al. (2007). "HD 17156b: A Transiting Planet with a 21.2 Day Period and an Eccentric Orbit". Astronomy and Astrophysics Letters. 476 (2): L13 –L16. arXiv: 0710.0898 . Bibcode:2007A&A...476L..13B. doi:10.1051/0004-6361:20078787. S2CID   14430349.

Further reading

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