TESS PDCSAP LIGHT COURBE FULL HD 35843. The transits of HD 35843 C are marked with dotted magenta lines. Credit: arxiv (2025). DOI: 10.48550 / Arxiv. 2005.00898
An international team of astronomers reports the discovery of two new exoplanets, sometimes more massive than the earth, in orbit around a solar star known as HD 35843. The conclusion was reported in a research document published on May 1 arxiv pre-print server.
To date, the Satellite of Investigation (Tess) in NASA transit has identified more than 7,600 candidates exoplanets (Tess of interest, or you), of which 622 have been confirmed by follow -up observations. The main objective of the satellite is to respond to a survey of approximately 200,000 of the brightest brilliant stars, looking for transit exoplanets – from small rocky worlds to gas giants.
HD 35843, or you 4189, is a G-Popor DWARF star with a radius of approximately 0.9 solar rays and a mass comparable to that of the sun. Tess observed this star between 2018 and 2022, which led to the detection of a transit signal in its light curve.
Observations on the monitoring ground for monitoring by a group of astronomers led by Katharine Hesse du Massachusetts Institute of Technology (MIT) confirmed the planetary nature of this signal and also revealed the presence of an additional planet.
“We report the discovery and confirmation of two orbit planets around the star -shaped star poor in metal, HD 35843 (you 4189)”, indicates the newspaper.
The confirmed exoplanet, designated HD 35843 C, is approximately 2.5 times larger and 11.3 times more massive than the earth, which gives a density at a level of 3.8 g / cm3. The planet orbits its host every 46.7 days, at a distance of 0.25 AU. The estimated equilibrium temperature of HD 35843 C is 479 K, so it is one of the coolest extraterrestrial worlds discovered with Tess.
The additional non -transient planet which has been identified by radial monitoring speed measures received the HD 35843 b designation. It is closer to the parent star – at a distance of approximately 0.088 AU and its orbital period is around 9.9 days. It is estimated that the planet has a mass of at least 5.84 masses of earth.
Based on the derived properties of the newly detected extrasolar worlds, astronomers classified HD 35843 B as a super-terre and HD 35843 C as an Exoplanet Sub-Neptune. It was noted that it is still too early to draw a final conclusion concerning the composition of HD 35843 C because it can be a “world of water” or a rocky planet with a thick hydrogen atmosphere.
With regard to the HD HD HD 35843, it has an effective temperature of 5,666 k and a metallicity at a level of -0.27. The age of the star is estimated at around 2.5 billion years.
The authors conclude that the Metric Spectroscopic with high transmission (TSM) of HD 35843 C and a relatively low temperature make it a promising target to conduct a monitoring study study with the James Webb space telescope (JWST) to determine its exact composition.
More information:
Katharine Hesse et al, HD 35843: a sun-shaped star hosting a long period sub-neutiament and interior super-terre, arxiv (2025). DOI: 10.48550 / Arxiv. 2005.00898
Newspaper information:
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