Astronomy:Gliese 357 d

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GJ 357 d
File:300px
Discovery
Discovered byRafael Luque, Diana Kossakowski
Discovery siteTESS
Discovery date2019
Radial velocity
Orbital characteristics
0.204±0.015 astronomical unit|AU[1]
Eccentricity≈0.033 ± 0.057[2]
Orbital period55.70±0.05 d[1]
Inclination<40°[2]
StarGliese 357
Physical characteristics
Mass6.1±1.0 M🜨[1] 7.20±1.07 M🜨[2]
Physics219.6 ± 5.9 K (−53.55 ± 5.90 °C; −64.39 ± 10.62 °F)[1]


Gliese 357 d is an exoplanet, considered to be a "Super-Earth" within the circumstellar habitable zone of its parent star.[3][4][5][6] The planet orbits Gliese 357, 31 light-years from the Solar System,[4] The system is part of the Hydra constellation.[4]

The planet was discovered by the TESS team and announced in July 2019. The data confirming the presence of the planet was uncovered in ground-based observation dating back to 1998 while confirming the TESS detection of Gliese 357 b, a “hot earth” that orbits much closer to the parent star.[6] Even though Gliese 357 d is 20% closer to Gliese 357 than Earth is to the Sun, Gliese 357 is much smaller than the Sun, receiving only as much energy as Mars. As a result, it is estimated that the average temperature is -64°F (-53°C), but this temperature is survivable for humans; if there is a thick enough atmosphere, the actual temperature could be much higher. If humans traveled there using modern spacecraft, it would take them about 660,000 years to get there.[lower-alpha 1] The planet is 6.1 times more massive than Earth and 2.3 times Earth's size.[8]

Footnotes

  1. ↑ Calculated assuming the spacecraft travels at 14 km/s. For comparison, the New Horizons spacecraft is exiting the solar system at a velocity of 13.7 km/s as of June 2024.[7]

References

  1. ↑ 1.0 1.1 1.2 1.3 Luque, R.; Pallé, E. et al. (2019). "Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization". Astronomy & Astrophysics 628: A39. doi:10.1051/0004-6361/201935801. ISSN 0004-6361. Bibcode: 2019A&A...628A..39L. https://www.aanda.org/articles/aa/full_html/2019/08/aa35801-19/aa35801-19.html. Retrieved 2020-05-12. 
  2. ↑ 2.0 2.1 2.2 Jenkins, J S; Pozuelos, F J et al. (2019). "GJ 357: a low-mass planetary system uncovered by precision radial velocities and dynamical simulations". Monthly Notices of the Royal Astronomical Society 490 (4): 5585–5595. doi:10.1093/mnras/stz2937. ISSN 0035-8711. 
  3. ↑ Falconer, Rebecca (2019-08-01). "Newly uncovered super-Earth 31 light-years away may be habitable". https://www.axios.com/super-earth-31-light-years-away-may-support-life-d1d0298d-3c82-4f99-a4af-22774fc1ed70.html. 
  4. ↑ 4.0 4.1 4.2 Reddy, Francis; Center, NASA’s Goddard Space Flight (2019-07-31). "TESS Discovers Habitable Zone Planet in GJ 357 System" (in en-US). https://scitechdaily.com/tess-discovers-habitable-zone-planet-in-gj-357-system/. 
  5. ↑ "Potentially habitable 'super-Earth' discovered just 31 light-years away" (in en). 31 July 2019. https://www.nbcnews.com/mach/science/potentially-habitable-super-earth-discovered-just-31-light-years-away-ncna1037491. 
  6. ↑ 6.0 6.1 Garner, Rob (2019-07-30). "NASA's TESS Helps Find Intriguing New World". http://www.nasa.gov/feature/goddard/2019/confirmation-of-toasty-tess-planet-leads-to-surprising-find-of-promising-world. 
  7. ↑ Talbert, Tricia (2021-04-15). "NASA's New Horizons Reaches a Rare Space Milestone". http://www.nasa.gov/feature/nasa-s-new-horizons-reaches-a-rare-space-milestone. 
  8. ↑ "plot_GJ_357.png". Planetary Habitability Laboratory. 2019-09-03. https://www.hpcf.upr.edu/~abel/phl/hec2/splots/plot_GJ_357.png. 



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