TOI 1338

TOI 1338 is a binary star system located in the constellation Pictor, about 1,320 light-years from Earth.[4] It was discovered by the Transiting Exoplanet Survey Satellite (TESS) and is orbited by the circumbinary planet TOI 1338 b.[1][2]

TOI 1338

Position of TOI 1338 in Pictor
Observation data
Epoch J2000      Equinox J2000
Constellation Pictor
Right ascension 06h 08m 31.94s.[1]
Declination −59° 32′ 27.55″.[1]
Apparent magnitude (V) 11.975±0.025
Astrometry
Radial velocity (Rv)24.68±8.08[2] km/s
Proper motion (μ) RA: -12.258±0.037[2] mas/yr
Dec.: 34.405±0.041[2] mas/yr
Parallax (π)2.4774 ± 0.0196[2] mas
Distance1,320 ± 10 ly
(404 ± 3 pc)
Details
TOI 1338 A
Mass1.20[3] M☉
TOI 1338 B
Mass0.3250[3] M☉
Other designations
TYC 8533-950-1, EBLM J0608-59, 2MASS J06083197-5932280, RAVE J060832.0-593228
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

Nomenclature and history

The acronym TOI stands for "TESS Objects of Interest." The planet was found by Wolf Cukier, a high school student, who joined the Goddard Space Flight Center as a summer intern. He looked through light curves that were flagged as eclipsing binaries by volunteers of the Planet Hunters citizen science project.[5] Cukier and six of the planet hunter volunteers are co-authors of the publication.[4]

Naming petition

In February 2021, a petition calling for the planet to be named SOPHIE received over 58,000 signatures.[6] Organisers of the petition sought to pay homage to the late musician and music producer Sophie, who passed away on 30 January 2021.[7] High-profile supporters of the campaign included Charli XCX and Caroline Polachek.[6]

The stellar binary

The two stars with masses of 1.13 and 0.313 M☉ revolve around each other every 14.6 days.[3][4] The system consists out of a G-type star and a red dwarf of spectral type M. The system has an age of 4.4 billion years.[4]

Planetary system

The Saturn-sized planet TOI 1338b has an orbit that is within ~1° coplanar with the binary. This means that the orbit of the binary and the orbit of the planet are on the same plane.[4] The spin of the primary star also aligns with the orbits of the binary and the planet (spin-orbit angle β = 2.8±17.1 °). This is the second time the Rossiter–McLaughlin effect was measured for a star hosting a circumbinary planet. Kepler-16 was the first system with such a measurement. The measurement of the alignment for TOI 1338 suggests that the planet formed from a single circumbinary disk.[8]

The TOI 1338 planetary system[4]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 33.0±20.0 M⊕ 0.4607+0.0084
−0.0088		 95.174+0.031
−0.035		 0.0880+0.0043
−0.0033		 89.37+0.35
−0.26°		 6.85±0.19 R⊕

See also

References
  1. "ExoFOP TIC 260128333". exofop.ipac.caltech.edu. Retrieved 9 January 2020.
  2. Gaia Collaboration (1 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. ISSN 0004-6361.
  3. Martin, David V.; Triaud, Amaury H. M. J.; Udry, Stephane; Marmier, Maxime; Maxted, Pierre F. L.; Cameron, Andrew Collier; Hellier, Coel; Pepe, Francesco; Pollacco, Don; Segransan, Damien; West, Richard (April 2019). "The BEBOP radial-velocity survey for circumbinary planets I. Eight years of CORALIE observations of 47 single-line eclipsing binaries and abundance constraints on the masses of circumbinary planets". Astronomy & Astrophysics. 624: A68. arXiv:1901.01627. Bibcode:2019A&A...624A..68M. doi:10.1051/0004-6361/201833669. ISSN 0004-6361.
  4. Kostov, Veselin B.; Orosz, Jerome A.; Feinstein, Adina D.; Welsh, William F.; Cukier, Wolf; Haghighipour, Nader; Quarles, Billy; Martin, David V.; Montet, Benjamin T.; Torres, Guillermo; Triaud, Amaury H. M. J. (7 May 2020). "TOI-1338: TESS' First Transiting Circumbinary Planet". The Astronomical Journal. 159 (6): 253. arXiv:2004.07783. doi:10.3847/1538-3881/ab8a48. hdl:10023/20067. ISSN 1538-3881. S2CID 215785933.
  5. "Discovery Alert! High School Student Finds a World With Two Suns". Exoplanet Exploration: Planets Beyond our Solar System. Retrieved 14 February 2020.
  6. "SOPHIE fans call for NASA to name a planet after the late musician". Dazed. Retrieved 4 February 2021.
  7. Richards, Will (30 January 2021). "DJ and producer SOPHIE has died". NME. Archived from the original on 30 January 2021. Retrieved 31 January 2021.
  8. Kunovac Hodzic, Vedad; Triaud, Amaury H. M. J.; Martin, David V.; Fabrycky, Daniel C.; Cegla, Heather M.; Collier Cameron, Andrew; Gill, Samuel; Hellier, Coel; Kostov, Veselin B.; Maxted, Pierre F. L.; Orosz, Jerome A. (1 July 2020). "The EBLM project - VII. Spin-orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A". Monthly Notices of the Royal Astronomical Society. 497 (2): 1627–1633. arXiv:2007.05514. Bibcode:2020MNRAS.497.1627K. doi:10.1093/mnras/staa2071. S2CID 220486377.
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