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TOI-700 d

Coordinates: Sky map 06h 28m 22.97s, −65° 34′ 43.01″
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TOI 700 d
Discovery
Discovered byEmily Gilbert
Discovery date3 January 2020
Transit
Orbital characteristics
0.163±0.015 AU
Eccentricity0.110+0.140
−0.079[1]
37.4260+0.0007
−0.0010 d
Inclination89.73+0.15
−0.12
StarTOI 700
Physical characteristics
Mean radius
1.19±0.11R🜨
Mass1.72+1.29
−0.63ME
Temperature268.8+7.7
−7.6 K[1]

TOI 700 d is an exoplanet, likely rocky, orbiting TOI 700, a red dwarf star 101.4 light-years away in the Dorado constellation. The exoplanet is the first Earth-sized exoplanet in the habitable zone discovered by the Transiting Exoplanet Survey Satellite (TESS).[2][3][4] It has been estimated that the planet receives about 86% the energy that the Earth receives from the Sun.[5]

Physical characteristics

Mass, radius and temperature

TOI 700 d is Earth-sized, an exoplanet that has a radius and mass similar to the Earth. It has an estimated mass of around 1.72 ME and a radius of 1.19 R🜨.

Host star

Main article: TOI 700

TOI 700 is a red dwarf of spectral class M that is 40% the mass, 40% the radius and 50% of the temperature of the Sun.[4] The star is bright with low levels of stellar activity. Over the 11 sectors observed with TESS, the star does not show a single white-light flare. The low rotation rate is also an indicator of low stellar activity.[6]

The TOI 700 planetary system[6]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 1.07+0.80
−0.43 M🜨 		0.0637+0.0064
−0.0060 		9.97701+0.00024
−0.00028 		— 89.67+0.23
−0.32° 		1.010+0.094
−0.087 R🜨
c 7.48+5.89
−3.30 M🜨 		0.0925+0.0088
−0.0083 		16.051098+0.000089
−0.000092 		— 88.90+0.08
−0.11° 		2.63+0.24
−0.23 R🜨
d 1.72+1.29
−0.63 M🜨 		0.163±0.015 37.4260+0.0007
−0.0010 		— 89.73+0.15
−0.12° 		1.19±0.11 R🜨

Orbit

TOI 700 d orbits its host star every 37.4260 days.

The TOI 700 multiplanetary system

Proposed habitability

TOI 700 d orbits in the habitable zone of its host star TOI 700.

Discovery

TOI 700 d was discovered by the Transiting Exoplanet Survey Satellite (TESS) in early January 2020.

TOI 700 multiplanetary system (video; 3:16)

See also

References

  1. ^ a b Rodriguez, Joseph E.; Vanderburg, Andrew; Zieba, Sebastian; Kreidberg, Laura; Morley, Caroline V.; Kane, Stephen R.; Spencer, Alton; Quinn, Samuel N.; Eastman, Jason D.; Cloutier, Ryan; Huang, Chelsea X. (3 January 2020). "The First Habitable Zone Earth-Sized Planet From TESS II: Spitzer Confirms TOI-700 d". arXiv:2001.00954 [astro-ph.EP].
  2. ^ Andreolo, Claire; Cofield, Calla; Kazmierczak, Jeanette (6 January 2020). "NASA Planet Hunter Finds Earth-Size Habitable-Zone World". NASA. Retrieved 6 January 2020.
  3. ^ Garner, Rob (6 January 2020). "NASA Planet Hunter Finds Earth-Size Habitable-Zone World". NASA. Retrieved 6 January 2020.
  4. ^ a b Wall, Mike (6 January 2020). "NASA's TESS Planet Hunter Finds Its 1st Earth-Size World in 'Habitable Zone'". Space.com. Retrieved 6 January 2020.
  5. ^ "[VIDEO] TOI 700d : une planète de la taille de la Terre découverte dans une "zone habitable"". midilibre.fr (in French). Retrieved 17 April 2020.
  6. ^ a b Gilbert, Emily A.; Barclay, Thomas; Schlieder, Joshua E.; Quintana, Elisa V.; Hord, Benjamin J.; Kostov, Veselin B.; Lopez, Eric D.; Rowe, Jason F.; Hoffman, Kelsey; Walkowicz, Lucianne M.; Silverstein, Michele L. (3 January 2020). "The First Habitable Zone Earth-sized Planet from TESS. I: Validation of the TOI-700 System". arXiv:2001.00952 [astro-ph.EP].

External links

  • TESS – Official WebSite
  • ExoFOP TIC 150428135 TOI-700 in the Exoplanet Follow-up Observing Program website
  • Gilbert, Emily A.; et al. (2020). "The First Habitable Zone Earth-sized Planet from TESS. I: Validation of the TOI-700 System". arXiv:2001.00952 [astro-ph.EP].
  • Rodriguez, Joseph E.; et al. (2020). "The First Habitable Zone Earth-Sized Planet from TESS II: Spitzer Confirms TOI-700 D". arXiv:2001.00954 [astro-ph.EP].
  • Suissa, Gabrielle; et al. (2020). "The First Habitable Zone Earth-sized Planet from TESS. III: Climate States and Characterization Prospects for TOI-700 D". arXiv:2001.00955 [astro-ph.EP].
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