NASA entdeckt womöglich lebensfreundlicheren Planeten als die Erde
Eine Studie zu der neuen Entdeckung wurde in der Fachzeitschrift Astrobiology veröffentlicht. Demnach handelt es sich bei dem Fund um den ...
Studie
Eine <anchor>Studie</anchor> zu der neuen Entdeckung wurde in der Fachzeitschrift Astrobiology veröffentlicht. Demnach handelt es sich bei dem Fund um den Exoplaneten LP 890-9c. Expoplanet bedeutet, dass sich der Planet außerhalb unseres Sonnensystems befindet und stattdessen unter dem Einfluss eines anderen Sterns steht, also Teil eines anderen Planetensystems ist. So auch der neu entdeckte Exoplanet LP 890-9c: Er wurde entdeckt, nachdem die NASA den Stern LP 890-9 genauer untersuchte und zunächst auf einen anderen Exoplaneten stieß, der diesen Stern umkreist. Nach genaueren Beobachtungen konnte das Weltraumteleskop TESS anschließend auch den Exoplaneten LP 890-9c in demselben System ausmachen.
Two Temperate Super-Earths Transiting A Nearby Late-type M Dwarf - Astrobiology
Two Temperate Super-Earths Transiting A Nearby Late-type M Dwarf - Astrobiology

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# Two Temperate Super-Earths Transiting A Nearby Late-type M Dwarf

By
[Keith Cowing](https://astrobiology.com/author/keith_cowing)

Press Release

astro-ph.EP

September 7, 2022

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Filed under
[astro-ph.EP](https://astrobiology.com/tag/astro-phep), [exoplanet](https://astrobiology.com/tag/exoplanet), [extrasolar](https://astrobiology.com/tag/extrasolar), [M-dwarf](https://astrobiology.com/tag/m-dwarf), [M6V](https://astrobiology.com/tag/m6v), [SPECULOOS-2](https://astrobiology.com/tag/speculoos-2), [Terrestrial Planet](https://astrobiology.com/tag/terrestrial-planet), [TESS](https://astrobiology.com/tag/tess), [TOI-4306](https://astrobiology.com/tag/toi-4306)

![Two Temperate Super-Earths Transiting A Nearby Late-type M Dwarf](https://astrobiology.com/wp-content/uploads/2022/09/Screen-Shot-2022-09-07-at-8.30.40-PM.png)

TESS target pixel files of LP 890-9 for sectors 4 (upper left), 5 (upper right), 31 (lower left), and 32 (lower right). The pixel scale is 2100 per pixel. The electron counts are colour-coded. The target is indicated by a white cross. Nearby sources identified in Gaia DR2 (Gaia Collaboration et al. 2018), up to 6 magnitudes in contrast with LP 890-9, are shown as red circles. The symbol size is proportional to the magnitude contrast with the target. The apertures used by the SPOC pipeline to extract the photometry are shown as red shaded regions. These plots were created with tpfplotter (Aller et al. 2020).

astro-ph.EP

In the age of JWST, temperate terrestrial exoplanets transiting nearby late-type M dwarfs provide unique opportunities for characterising their atmospheres, as well as searching for biosignature gases.

We report here the discovery and validation of two temperate super-Earths transiting LP 890-9 (TOI-4306, SPECULOOS-2), a relatively low-activity nearby (32 pc) M6V star. The inner planet, LP 890-9b, was first detected by TESS (and identified as TOI-4306.01) based on four sectors of data. Intensive photometric monitoring of the system with the SPECULOOS Southern Observatory then led to the discovery of a second outer transiting planet, LP 890-9c (also identified as SPECULOOS-2c), previously undetected by TESS.

The orbital period of this second planet was later confirmed by MuSCAT3 follow-up observations. With a mass of 0.118±0.002 M⊙, a radius of 0.1556±0.0086 R⊙, and an effective temperature of 2850±75 K, LP 890-9 is the second-coolest star found to host planets, after TRAPPIST-1. The inner planet has an orbital period of 2.73 d, a radius of 1.320+0.053−0.027 R⊕, and receives an incident stellar flux of 4.09±0.12 S⊕. The outer planet has a similar size of 1.367+0.055−0.039 R⊕ and an orbital period of 8.46 d. With an incident stellar flux of 0.906 ± 0.026 S⊕, it is located within the conservative habitable zone, very close to its inner limit.

Although the masses of the two planets remain to be measured, we estimated their potential for atmospheric characterisation via transmission spectroscopy using a mass-radius relationship and found that, after the TRAPPIST-1 planets, LP 890-9c is the second-most favourable habitable-zone terrestrial planet known so far. The discovery of this remarkable system offers another rare opportunity to study temperate terrestrial planets around our smallest and coolest neighbours.

L. Delrez, C. A. Murray, F. J. Pozuelos, N. Narita, E. Ducrot, M. Timmermans, N. Watanabe, A. J. Burgasser, T. Hirano, B. V. Rackham, K. G. Stassun, V. Van Grootel, C. Aganze, M. Cointepas, S. Howell, L. Kaltenegger, P. Niraula, D. Sebastian, J. M. Almenara, K. Barkaoui, T. A. Baycroft, X. Bonfils, F. Bouchy, A. Burdanov, D. A. Caldwell, D. Charbonneau, D. R. Ciardi, K. A. Collins, T. Daylan, B. -O. Demory, J. de Wit, G. Dransfield, S. B. Fajardo-Acosta, M. Fausnaugh, A. Fukui, E. Furlan, L. J. Garcia, C. L. Gnilka, Y. Gómez Maqueo Chew, M. A. Gómez-Muñoz, M. N. Günther, H. Harakawa, K. Heng, M. J. Hooton, Y. Hori, M. Ikoma, E. Jehin, J. M. Jenkins, T. Kagetani, K. Kawauchi, T. Kimura, T. Kodama, T. Kotani, V. Krishnamurthy, T. Kudo, V. Kunovac, N. Kusakabe, D. W. Latham, C. Littlefield, J. McCormac, C. Melis, M. Mori, F. Murgas, E. Palle, P. P. Pedersen, D. Queloz, G. Ricker, L. Sabin, N. Schanche, U. Schroffenegger, S. Seager, B. Shiao, S. Sohy, M. R. Standing, M. Tamura, C. A. Theissen, S. J. Thompson, A. H. M. J. Triaud, R. Vanderspek, S. Vievard, R. D. Wells, J. N. Winn, Y. Zou, S. Zúñiga-Fernández, M. Gillon

Comments: 31 pages, 19 figures, 7 tables. Accepted for publication in A&A

Subjects: Earth and Planetary Astrophysics (astro-ph.EP)

Cite as: arXiv:2209.02831 \[astro-ph.EP\] (or arXiv:2209.02831v1 \[astro-ph.EP\] for this version)

Related DOI:

[https://doi.org/10.1051/0004-6361/202244041](https://doi.org/10.1051/0004-6361/202244041)

Focus to learn more

Submission history

From: Laetitia Delrez

\[v1\] Tue, 6 Sep 2022 22:04:59 UTC (10,531 KB)

**Full paper: [https://arxiv.org/abs/2209.02831](https://arxiv.org/abs/2209.02831)**

Astrobiology

![](https://astrobiology.com/wp-content/uploads/2022/08/keith_cowing.jpg)

[Keith Cowing](https://astrobiology.com/author/keith_cowing)

Explorers Club Fellow, ex-NASA Space Station Payload manager/space biologist, Away Teams, Journalist, Lapsed climber, Synaesthete, Na’Vi-Jedi-Freman-Buddhist-mix, ASL, Devon Island and Everest Base Camp veteran, (he/him) 🖖🏻

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