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Publication Detail
Hot planets around cool stars – two short-period mini-Neptunes transiting the late K-dwarf TOI-1260
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Article
  • Authors:
    Georgieva IY, Persson CM, Barragán O, Nowak G, Fridlund M, Locci D, Palle E, Luque R, Carleo I, Gandolfi D, Kane SR, Korth J, Stassun KG, Livingston J, Matthews EC, Collins KA, Howell SB, Serrano LM, Albrecht S, Bieryla A, Brasseur CE, Ciardi D, Cochran WD, Colon KD, Crossfield IJM, Csizmadia S, Deeg HJ, Esposito M, Furlan E, Gan T, Goffo E, Gonzales E, Grziwa S, Guenther EW, Guerra P, Hirano T, Jenkins JM, Jensen ELN, Kabáth P, Knudstrup E, Lam KWF, Latham DW, Levine AM, Matson RA, McDermott S, Osborne HLM, Paegert M, Quinn SN, Redfield S, Ricker GR, Schlieder JE, Scott NJ, Seager S, Smith AMS, Tenenbaum P, Twicken JD, Vanderspek R, Van Eylen V, Winn JN
  • Publisher:
    Oxford University Press (OUP)
  • Publication date:
    01/08/2021
  • Journal:
    Monthly Notices of the Royal Astronomical Society
  • Status:
    Published
  • Print ISSN:
    0035-8711
  • Language:
    en
Abstract
Abstract We present the discovery and characterization of two sub-Neptunes in close orbits, as well as a tentative outer planet of a similar size, orbiting TOI-1260 – a low metallicity K6 Vdwarf star. Photometry from TESS yields radii of Rb = 2.33 ± 0.10 R⊕ and Rc = 2.82 ± 0.15 R⊕, and periods of 3.13 and 7.49 days for TOI-1260 b and TOI-1260 c, respectively. We combined the TESS data with a series of ground-based follow-up observations to characterize the planetary system. From HARPS-N high-precision radial velocities we obtain Mb =$8.6 _{ - 1.5 } ^ { + 1.4 }$ M⊕ and Mc =$11.8 _{ - 3.2 } ^ { + 3.4 }$ M⊕. The star is moderately active with a complex activity pattern, which necessitated the use of Gaussian process regression for both the light curve detrending and the radial velocity modelling, in the latter case guided by suitable activity indicators. We successfully disentangle the stellar-induced signal from the planetary signals, underlining the importance and usefulness of the Gaussian Process approach. We test the system’s stability against atmospheric photoevaporation and find that the TOI-1260 planets are classic examples of the structure and composition ambiguity typical for the 2 − 3 R⊕ range.
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