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Wolf 327b: a new member of the pack of ultra-short-period super-Earths around M dwarfs

Planets with orbital periods shorter than 1 day are rare and have formation histories that are not completely understood. Small (Rp < 2 R⊕) ultra-short-period (USP) planets are highly irradiated, probably have rocky compositions with high bulk densities, and are often found in multi-planet system...

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Main Authors: Murgas, Felipe (Author) , Pallé, Enric (Author) , Orell-Miquel, Jaume (Author) , Carleo, I. (Author) , Peña-Moñino, L. (Author) , Pérez-Torres, M. (Author) , Watkins, C. N. (Author) , Jeffers, Sandra (Author) , Azzaro, M. (Author) , Barkaoui, K. (Author) , Belinski, A. A. (Author) , Caballero, José A. (Author) , Charbonneau, David (Author) , Cheryasov, D. V. (Author) , Ciardi, D. R. (Author) , Collins, K. A. (Author) , Cortés-Contreras, Miriam (Author) , Leon, J. de (Author) , Duque-Arribas, C. (Author) , Enoc, G. (Author) , Esparza-Borges, Emma (Author) , Fukui, Akihiko (Author) , Geraldía-González, S. (Author) , Gilbert, E. A. (Author) , Hatzes, Artie (Author) , Hayashi, Y. (Author) , Henning, Thomas (Author) , Herrero, E. (Author) , Jenkins, J. M. (Author) , Lillo-Box, J. (Author) , Lodieu, N. (Author) , Lund, M. B. (Author) , Luque, Rafael (Author) , Montes, D. (Author) , Nagel, E. (Author) , Narita, N. (Author) , Parviainen, H. (Author) , Polanski, A. S. (Author) , Reffert, Sabine (Author) , Schlecker, Martin (Author) , Schöfer, Patrick (Author) , Schwarz, R. P. (Author) , Schweitzer, A. (Author) , Seager, Sara (Author) , Stassun, K. G. (Author) , Tabernero, H. M. (Author) , Terada, Yukikatsu (Author) , Twicken, J. D. (Author) , Vanaverbeke, S. (Author) , Winn, J. N. (Author) , Zambelli, R. (Author) , Amado, Pedro José (Author) , Quirrenbach, Andreas (Author) , Reiners, Ansgar (Author) , Ribas, Ignasi (Author)
Format: Article (Journal)
Language:English
Published: 05 April 2024
In: Astronomy and astrophysics
Year: 2024, Volume: 684, Pages: 1-24
ISSN:1432-0746
DOI:10.1051/0004-6361/202348813
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202348813
Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2024/04/aa48813-23/aa48813-23.html
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Author Notes:F. Murgas, E. Pallé, J. Orell-Miquel, I. Carleo, L. Peña-Moñino, M. Pérez-Torres, C.N. Watkins, S.V. Jeffers, M. Azzaro, K. Barkaoui, A.A. Belinski, J.A. Caballero, D. Charbonneau, D.V. Cheryasov, D.R. Ciardi, K.A. Collins, M. Cortés-Contreras, J. de Leon, C. Duque-Arribas, G. Enoc, E. Esparza-Borges, A. Fukui, S. Geraldía-González, E. A. Gilbert, A.P. Hatzes, Y. Hayashi, Th. Henning, E. Herrero, J.M. Jenkins, J. Lillo-Box, N. Lodieu, M.B. Lund, R. Luque, D. Montes, E. Nagel, N. Narita, H. Parviainen, A.S. Polanski, S. Reffert, M. Schlecker, P. Schöfer, R.P. Schwarz, A. Schweitzer, S. Seager, K.G. Stassun, H.M. Tabernero, Y. Terada, J.D. Twicken, S. Vanaverbeke, J.N. Winn, R. Zambelli, P.J. Amado, A. Quirrenbach, A. Reiners, and I. Ribas
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Summary:Planets with orbital periods shorter than 1 day are rare and have formation histories that are not completely understood. Small (Rp < 2 R⊕) ultra-short-period (USP) planets are highly irradiated, probably have rocky compositions with high bulk densities, and are often found in multi-planet systems. Additionally, USP planets found around small stars are excellent candidates for characterization using present-day instrumentation. Of the current full sample of approximately 5500 confirmed exoplanets, only 130 are USP planets and around 40 have mass and radius measurements. Wolf 327 (TOI-5747) is an M dwarf (R* = 0.406 ± 0.015 R⊙, M* = 0.405 ± 0.019 M⊙, Teff = 3542 ± 70 K, and V = 13 mag) located at a distance d = 28.5 pc. NASA’s planet hunter satellite, TESS, detected transits in this star with a period of 0.573 day (13.7 h) and with a transit depth of 818 ppm. Ground-based follow-up photometry, high resolution imaging, and radial velocity (RV) measurements taken with the CARMENES spectrograph confirm the presence of this new USP planet. Wolf 327b is a super-Earth with a radius of Rp = 1.24 ± 0.06 R⊕ and a mass of Mp = 2.53 ± 0.46 M⊕, yielding a bulk density of 7.24 ± 1.66 g cm−3 and thus suggesting a rocky composition. Owing to its close proximity to its host star (a = 0.01 au), Wolf 327b has an equilibrium temperature of 996 ± 22 K. This planet has a mass and radius similar to K2-229b, a planet with an inferred Mercury-like internal composition. Planet interior models suggest that Wolf 327b has a large iron core, a small rocky mantle, and a negligible (if any) H/He atmosphere.
Item Description:Gesehen am 04.02.2025
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/202348813

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