A Super-Earth and two sub-Neptunes transiting the bright, nearby, and quiet M-dwarf TOI-270
We report the Transiting Exoplanet Survey Satellite (TESS) discovery of three small planets transiting one of the brightest (K-mag 8.3) and nearest (22.5 parsec) M-dwarf hosts to date, TOI-270 (TIC 259377017). The system is observationally favourable, and can be exceptionally well characterised over the next few years. The M3V-type star is transited by the Super-Earth-sized TOI-270b (1.25 Rearth) and the sub-Neptune-sized exoplanets TOI-270 c (2.42 Rearth) and TOI-270 d (2.13 Rearth). The planet configuration is close to a mean-motion resonant chain, with the orbital periods (3.36, 5.66, and 11.38 days) near ratios of small integers (5:3 and 2:1). Notably, the equilibrium temperature of the outer planet (340 K) lies within the survivable range for extremophile organisms. TOI-270 will be a prime target for future studies since: 1) its near-resonance allows the detection of transit timing variations (TTVs) for precise mass measurements and detailed dynamical studies; 2) its brightness enables independent radial velocity (RV) mass measurements; 3) the outer planets are ideal for atmospheric characterisation via transmission spectroscopy with the James Webb Space Telescope (JWST); and 4) the quiet host star is well suited for future searches of terrestrial planets within the habitable zone. Altogether, very few systems with temperate small exoplanets are as suitable for complementary characterisation by TTVs, RVs and transmission spectroscopy as TOI-270.
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Maximilian N. Günther (edit)
Francisco J. Pozuelos (add twitter)
Jason A. Dittmann (add twitter)
Diana Dragomir (edit)
Stephen Kane (edit)
Tansu Daylan (edit)
Adina Feinstein (edit)
Chelsea Huang (edit)
Tim Morton (edit)
Andrea Bonfanti (edit)
Luke Bouma (edit)
Jennifer Burt (edit)
Karen A. Collins (edit)
Jack J. Lissauer (add twitter)
Elisabeth Matthews (add twitter)
Andrew Vanderburg (add twitter)
Songhu Wang (edit)
Jennifer Winters (edit)
George R. Ricker (add twitter)
Roland K. Vanderspek (edit)
David W. Latham (edit)
Sara Seager (edit)
Joshua N. Winn (edit)
Jon M. Jenkins (edit)
James D. Armstrong (edit)
Khalid Barakoui (add twitter)
Natalie Batalha (edit)
Jacob Bean (add twitter)
Douglas A. Caldwell (add twitter)
David Ciardi (edit)
Kevin I. Collins (edit)
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Tianjun Gan (add twitter)
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ralvar314: RT @StarshipBuilder: A Super-Earth and two sub-Neptunes transiting the bright, nearby, and quiet M-dwarf TOI-270 https://t.co/6E3qFT5u63 "n…
ralvar314: RT @qraal: [1903.06107] A Super-Earth and two sub-Neptunes transiting the bright, nearby, and quiet M-dwarf TOI-270 https://t.co/lbSovIoArW
IanAdAstra: RT @StarshipBuilder: A Super-Earth and two sub-Neptunes transiting the bright, nearby, and quiet M-dwarf TOI-270 https://t.co/6E3qFT5u63 "n…
scimichael: A Super-Earth and two sub-Neptunes transiting the bright, nearby, and quiet M-dwarf TOI-270 https://t.co/1n9OMYxMwP
StarshipBuilder: A Super-Earth and two sub-Neptunes transiting the bright, nearby, and quiet M-dwarf TOI-270 https://t.co/6E3qFT5u63 "nearest (22.5 parsec) M-dwarf hosts to date," Only 740 years at 0.1c
qraal: [1903.06107] A Super-Earth and two sub-Neptunes transiting the bright, nearby, and quiet M-dwarf TOI-270 https://t.co/lbSovIoArW
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