The HD 260655 system: Two rocky worlds transiting a bright M dwarf at 10 pc

R. Luque; B. J. Fulton; M. Kunimoto; P. J. Amado; P. Gorrini; S. Dreizler; C. Hellier; G. W. Henry; K. Molaverdikhani; G. Morello; L. Peña-Moñino; M. Pérez-Torres; F. J. Pozuelos; Y. Shan; G. Anglada-Escudé; V. J. S. Béjar; G. Bergond; A. W. Boyle; J. A. Caballero; D. Charbonneau; D. R. Ciardi; S. Dufoer; N. Espinoza; M. Everett; D. Fischer; A. P. Hatzes; Th. Henning; K. Hesse; A. Howard; S. B. Howell; H. Isaacson; S. V. Jeffers; J. M. Jenkins; S. R. Kane; J. Kemmer; S. Khalafinejad; R. C. Kidwell; D. Kossakowski; D. W. Latham; J. Lillo-Box; J. J. Lissauer; D. Montes; J. Orell-Miquel; E. Pallé; D. Pollacco; A. Quirrenbach; S. Reffert; A. Reiners; I. Ribas; G. R. Ricker

doi:10.1051/0004-6361/202243834

The HD 260655 system: Two rocky worlds transiting a bright M dwarf at 10 pc

Earth and Planetary Astrophysics 2022-08-31 v3 Space Physics

Authors: R. Luque , B. J. Fulton , M. Kunimoto , P. J. Amado , P. Gorrini , S. Dreizler , C. Hellier , G. W. Henry , K. Molaverdikhani , G. Morello , L. Peña-Moñino , M. Pérez-Torres , F. J. Pozuelos , Y. Shan , G. Anglada-Escudé , V. J. S. Béjar , G. Bergond , A. W. Boyle , J. A. Caballero , D. Charbonneau , D. R. Ciardi , S. Dufoer , N. Espinoza , M. Everett , D. Fischer , A. P. Hatzes , Th. Henning , K. Hesse , A. Howard , S. B. Howell , H. Isaacson , S. V. Jeffers , J. M. Jenkins , S. R. Kane , J. Kemmer , S. Khalafinejad , R. C. Kidwell , D. Kossakowski , D. W. Latham , J. Lillo-Box , J. J. Lissauer , D. Montes , J. Orell-Miquel , E. Pallé , D. Pollacco , A. Quirrenbach , S. Reffert , A. Reiners , I. Ribas , G. R. Ricker , L. A. Rogers , J. Sanz-Forcada , M. Schlecker , A. Schweitzer , S. Seager , A. Shporer , K. G. Stassun , S. Stock , L. Tal-Or , E. B. Ting , T. Trifonov , S. Vanaverbeke , R. Vanderspek , J. Villaseñor , J. N. Winn , J. G. Winters , M. R. Zapatero Osorio

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Abstract

We report the discovery of a multi-planetary system transiting the M0 V dwarf HD 260655 (GJ 239, TOI-4599). The system consists of at least two transiting planets, namely HD 260655 b, with a period of 2.77 d, a radius of R $_b$ = 1.240 $\pm$ 0.023 R $_\oplus$ , a mass of M $_b$ = 2.14 $\pm$ 0.34 M $_\oplus$ , and a bulk density of $\rho_b$ = 6.2 $\pm$ 1.0 g cm $^{-3}$ , and HD 260655 c, with a period of 5.71 d, a radius of R $_c$ = 1.533 $^{+0.051}_{-0.046}$ R $_\oplus$ , a mass of M $_c$ = 3.09 $\pm$ 0.48 M $_\oplus$ , and a bulk density of $\rho_c$ = 4.7 $^{+0.9}_{-0.8}$ g cm $^{-3}$ . The planets were detected in transit by the TESS mission and confirmed independently with archival and new precise radial velocities obtained with the HIRES and CARMENES instruments since 1998 and 2016, respectively. At a distance of 10 pc, HD 260655 becomes the fourth closest known multi-transiting planet system after HD 219134, LTT 1445 A, and AU Mic. Due to the apparent brightness of the host star (J = 6.7 mag), both planets are among the most suitable rocky worlds known today for atmospheric studies with the JWST, both in transmission and emission.

Keywords

hd 260655 transiting planets m dwarf rocky worlds tess radial velocity jwst multi-planetary system

Cite

@article{arxiv.2204.10261,
  title  = {The HD 260655 system: Two rocky worlds transiting a bright M dwarf at 10 pc},
  author = {R. Luque and B. J. Fulton and M. Kunimoto and P. J. Amado and P. Gorrini and S. Dreizler and C. Hellier and G. W. Henry and K. Molaverdikhani and G. Morello and L. Peña-Moñino and M. Pérez-Torres and F. J. Pozuelos and Y. Shan and G. Anglada-Escudé and V. J. S. Béjar and G. Bergond and A. W. Boyle and J. A. Caballero and D. Charbonneau and D. R. Ciardi and S. Dufoer and N. Espinoza and M. Everett and D. Fischer and A. P. Hatzes and Th. Henning and K. Hesse and A. Howard and S. B. Howell and H. Isaacson and S. V. Jeffers and J. M. Jenkins and S. R. Kane and J. Kemmer and S. Khalafinejad and R. C. Kidwell and D. Kossakowski and D. W. Latham and J. Lillo-Box and J. J. Lissauer and D. Montes and J. Orell-Miquel and E. Pallé and D. Pollacco and A. Quirrenbach and S. Reffert and A. Reiners and I. Ribas and G. R. Ricker and L. A. Rogers and J. Sanz-Forcada and M. Schlecker and A. Schweitzer and S. Seager and A. Shporer and K. G. Stassun and S. Stock and L. Tal-Or and E. B. Ting and T. Trifonov and S. Vanaverbeke and R. Vanderspek and J. Villaseñor and J. N. Winn and J. G. Winters and M. R. Zapatero Osorio},
  journal= {arXiv preprint arXiv:2204.10261},
  year   = {2022}
}

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24 pages, 17 figures. Accepted for publication in A&A

The HD 260655 system: Two rocky worlds transiting a bright M dwarf at 10 pc

Abstract

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