All Outputs (161)

Warm Jupiters in TESS Full-frame Images: A Catalog and Observed Eccentricity Distribution for Year 1 (2021)
Journal Article
Hellier. (2021). Warm Jupiters in TESS Full-frame Images: A Catalog and Observed Eccentricity Distribution for Year 1. Astrophysical Journal, https://doi.org/10.3847/1538-4365/abf73c

Warm Jupiters—defined here as planets larger than 6 Earth radii with orbital periods of 8–200 days—are a key missing piece in our understanding of how planetary systems form and evolve. It is currently debated whether Warm Jupiters form in situ, unde... Read More about Warm Jupiters in TESS Full-frame Images: A Catalog and Observed Eccentricity Distribution for Year 1.

TOI-269 b: an eccentric sub-Neptune transiting a M2 dwarf revisited with ExTrA (2021)
Journal Article
Cointepas, M., Almenara, J. M., Bonfils, X., Bouchy, F., Astudillo-Defru, N., Murgas, F., …Jenkins, J. M. (2021). TOI-269 b: an eccentric sub-Neptune transiting a M2 dwarf revisited with ExTrA. Astronomy & Astrophysics, 650, Article ARTN A145. https://doi.org/10.1051/0004-6361/202140328

We present the confirmation of a new sub-Neptune close to the transition between super-Earths and sub-Neptunes transiting the M2 dwarf TOI-269 (TIC 220 479 565, V = 14.4 mag, J = 10.9 mag, R⋆ = 0.40 R⊙, M⋆ = 0.39 M⊙, d = 57 pc). The exoplanet candida... Read More about TOI-269 b: an eccentric sub-Neptune transiting a M2 dwarf revisited with ExTrA.

TESS Delivers Five New Hot Giant Planets Orbiting Bright Stars from the Full-frame Images (2021)
Journal Article
Hellier. (2021). TESS Delivers Five New Hot Giant Planets Orbiting Bright Stars from the Full-frame Images. Astronomical Journal, https://doi.org/10.3847/1538-3881/abe38a

We present the discovery and characterization of five hot and warm Jupiters—TOI-628 b (TIC 281408474; HD 288842), TOI-640 b (TIC 147977348), TOI-1333 b (TIC 395171208, BD+47 3521A), TOI-1478 b (TIC 409794137), and TOI-1601 b (TIC 139375960)—based on... Read More about TESS Delivers Five New Hot Giant Planets Orbiting Bright Stars from the Full-frame Images.

A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113 (2021)
Journal Article
Hellier. (2021). A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113. Monthly Notices of the Royal Astronomical Society, 4842 - 4857. https://doi.org/10.1093/mnras/stab182

We report the discovery of HD?110113?b (TESS object of interest-755.01), a transiting mini-Neptune exoplanet on a 2.5-d orbit around the solar-analogue HD?110113 (Teff = 5730 K). Using TESS photometry and High Accuracy Radial velocity Planet Searcher... Read More about A hot mini-Neptune in the radius valley orbiting solar analogue HD 110113.

TIC 168789840: A Sextuply Eclipsing Sextuple Star System (2021)
Journal Article
Hellier. (2021). TIC 168789840: A Sextuply Eclipsing Sextuple Star System. Astronomical Journal, 162 - 162. https://doi.org/10.3847/1538-3881/abddb5

We report the discovery of a sextuply eclipsing sextuple star system from TESS data, TIC 168789840, also known as TYC 7037-89-1, the first known sextuple system consisting of three eclipsing binaries. The target was observed in Sectors 4 and 5 during... Read More about TIC 168789840: A Sextuply Eclipsing Sextuple Star System.

A nearby transiting rocky exoplanet that is suitable for atmospheric investigation. (2021)
Journal Article
Hellier. (2021). A nearby transiting rocky exoplanet that is suitable for atmospheric investigation. Science, 1038 - 1041. https://doi.org/10.1126/science.abd7645

Spectroscopy of transiting exoplanets can be used to investigate their atmospheric properties and habitability. Combining radial velocity (RV) and transit data provides additional information on exoplanet physical properties. We detect a transiting r... Read More about A nearby transiting rocky exoplanet that is suitable for atmospheric investigation..

TESS Discovery of a Super-Earth and Three Sub-Neptunes Hosted by the Bright, Sun-like Star HD 108236 (2021)
Journal Article
Hellier. (2021). TESS Discovery of a Super-Earth and Three Sub-Neptunes Hosted by the Bright, Sun-like Star HD 108236. Astronomical Journal, https://doi.org/10.3847/1538-3881/abd73e

We report the discovery and validation of four extrasolar planets hosted by the nearby, bright, Sun-like (G3V) star HD 108236 using data from the Transiting Exoplanet Survey Satellite (TESS). We present transit photometry, reconnaissance, and precise... Read More about TESS Discovery of a Super-Earth and Three Sub-Neptunes Hosted by the Bright, Sun-like Star HD 108236.

TESS Hunt for Young and Maturing Exoplanets (THYME). IV. Three Small Planets Orbiting a 120 Myr Old Star in the Pisces-Eridanus Stream (2021)
Journal Article
Newton, E. R., Mann, A. W., Kraus, A. L., Livingston, J. H., Vanderburg, A., Curtis, J. L., …Latham, D. W. (2021). TESS Hunt for Young and Maturing Exoplanets (THYME). IV. Three Small Planets Orbiting a 120 Myr Old Star in the Pisces-Eridanus Stream. Astronomical Journal, 161(2), Article ARTN 65. https://doi.org/10.3847/1538-3881/abccc6

Young exoplanets can offer insight into the evolution of planetary atmospheres, compositions, and architectures. We present the discovery of the young planetary system TOI 451 (TIC 257605131, Gaia DR2 4844691297067063424). TOI 451 is a member of the... Read More about TESS Hunt for Young and Maturing Exoplanets (THYME). IV. Three Small Planets Orbiting a 120 Myr Old Star in the Pisces-Eridanus Stream.

Abundance measurements of H2O and carbon-bearing species in the atmosphere of WASP-127b confirm its super-solar metallicity (2021)
Journal Article
Hellier. (2021). Abundance measurements of H2O and carbon-bearing species in the atmosphere of WASP-127b confirm its super-solar metallicity. Monthly Notices of the Royal Astronomical Society, 4042-4064. https://doi.org/10.1093/mnras/staa3116

The chemical abundances of exoplanet atmospheres may provide valuable information about the bulk compositions, formation pathways, and evolutionary histories of planets. Exoplanets with large, relatively cloud-free atmospheres, and which orbit bright... Read More about Abundance measurements of H2O and carbon-bearing species in the atmosphere of WASP-127b confirm its super-solar metallicity.

The CARMENES search for exoplanets around M dwarfs: LP 714-47 b (TOI 442.01): populating the Neptune desert (2020)
Journal Article
Hellier. (2020). The CARMENES search for exoplanets around M dwarfs: LP 714-47 b (TOI 442.01): populating the Neptune desert. Astronomy and Astrophysics, https://doi.org/10.1051/0004-6361/202038016

We report the discovery of a Neptune-like planet (LP 714-47 b, P = 4.05204 d, mb = 30.8 ± 1.5M?, Rb = 4.7 ± 0.3 R?) located in the “hot Neptune desert”. Confirmation of the TESS Object of Interest (TOI 442.01) was achieved with radial-velocity follow... Read More about The CARMENES search for exoplanets around M dwarfs: LP 714-47 b (TOI 442.01): populating the Neptune desert.

Two Young Planetary Systems around Field Stars with Ages between 20 and 320 Myr from TESS (2020)
Journal Article
Hellier. (2020). Two Young Planetary Systems around Field Stars with Ages between 20 and 320 Myr from TESS. Astronomical Journal, 2 - 2. https://doi.org/10.3847/1538-3881/abba22

Planets around young stars trace the early evolution of planetary systems. We report the discovery and validation of two planetary systems with ages ?300 Myr from observations by the Transiting Exoplanet Survey Satellite (TESS). The Myr old G star TO... Read More about Two Young Planetary Systems around Field Stars with Ages between 20 and 320 Myr from TESS.

Orbital and physical parameters of eclipsing binaries from the ASAS catalogue – XI. CHIRON investigation of long-period binaries* (2020)
Journal Article
Hellier. (2020). Orbital and physical parameters of eclipsing binaries from the ASAS catalogue – XI. CHIRON investigation of long-period binaries*. Monthly Notices of the Royal Astronomical Society, https://doi.org/10.1093/mnras/staa3488

We present the results of a spectroscopic campaign on eclipsing binaries with long orbital period (P = 20 - 75 d) carried out with the CHIRON spectrograph. Physical and orbital solutions for seven systems were derived from the V-band, and I-band ASAS... Read More about Orbital and physical parameters of eclipsing binaries from the ASAS catalogue – XI. CHIRON investigation of long-period binaries*.

WASP-186 and WASP-187: two hot Jupiters discovered by SuperWASP and SOPHIE with additional observations by TESS (2020)
Journal Article
Smalley, Hellier, & Maxted. (2020). WASP-186 and WASP-187: two hot Jupiters discovered by SuperWASP and SOPHIE with additional observations by TESS. Monthly Notices of the Royal Astronomical Society, 428-440. https://doi.org/10.1093/mnras/staa2848

We present the discovery of two new hot Jupiters identified from the WASP survey, WASP-186b and WASP-187b (TOI-1494.01 and TOI-1493.01). Their planetary nature was established from SOPHIE spectroscopic observations, and additional photometry was obta... Read More about WASP-186 and WASP-187: two hot Jupiters discovered by SuperWASP and SOPHIE with additional observations by TESS.

The EBLM project. VII. Spin–orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A (2020)
Journal Article
Maxted, & Hellier. (2020). The EBLM project. VII. Spin–orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A. Monthly Notices of the Royal Astronomical Society, 1627-1633. https://doi.org/10.1093/mnras/staa2071

A dozen short-period detached binaries are known to host transiting circumbinary planets. In all circumbinary systems so far, the planetary and binary orbits are aligned within a couple of degrees. However, the obliquity of the primary star, which is... Read More about The EBLM project. VII. Spin–orbit alignment for the circumbinary planet host EBLM J0608-59 A/TOI-1338 A.

The TOI-763 system: sub-Neptunes orbiting a Sun-like star (2020)
Journal Article
Hellier. (2020). The TOI-763 system: sub-Neptunes orbiting a Sun-like star. Monthly Notices of the Royal Astronomical Society, 4503-4517. https://doi.org/10.1093/mnras/staa2502

We report the discovery of a planetary system orbiting TOI-763 (aka CD-39 7945), a V = 10.2, high proper motion G-type dwarf star that was photometrically monitored by the TESS space mission in Sector 10. We obtain and model the stellar spectrum and... Read More about The TOI-763 system: sub-Neptunes orbiting a Sun-like star.

The Multiplanet System TOI-421*: A Warm Neptune and a Super Puffy Mini-Neptune Transiting a G9 V Star in a Visual Binary* (2020)
Journal Article
Hellier. (2020). The Multiplanet System TOI-421*: A Warm Neptune and a Super Puffy Mini-Neptune Transiting a G9 V Star in a Visual Binary*. Astronomical Journal, https://doi.org/10.3847/1538-3881/aba124

We report the discovery of a warm Neptune and a hot sub-Neptune transiting TOI-421 (BD-14 1137, TIC 94986319), a bright (V = 9.9) G9 dwarf star in a visual binary system observed by the Transiting Exoplanet Survey Satellite (TESS) space mission in Se... Read More about The Multiplanet System TOI-421*: A Warm Neptune and a Super Puffy Mini-Neptune Transiting a G9 V Star in a Visual Binary*.

Discovery and characterization of the exoplanets WASP-148b and c - A transiting system with two interacting giant planets (2020)
Journal Article
Hellier, Smalley, & Maxted. (2020). Discovery and characterization of the exoplanets WASP-148b and c - A transiting system with two interacting giant planets. Astronomy and Astrophysics, https://doi.org/10.1051/0004-6361/202038296

We present the discovery and characterization of WASP-148, a new extrasolar system that includes at least two giant planets. The host star is a slowly rotating inactive late-G dwarf with a V = 12 magnitude. The planet WASP-148b is a hot Jupiter of 0.... Read More about Discovery and characterization of the exoplanets WASP-148b and c - A transiting system with two interacting giant planets.

TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet (2020)
Journal Article
Hellier. (2020). TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet. Astronomical Journal, https://doi.org/10.3847/1538-3881/ab9f95

The Transiting Exoplanet Survey Satellite mission was designed to find transiting planets around bright, nearby stars. Here, we present the detection and mass measurement of a small, short-period (˜4 days) transiting planet around the bright (V = 7.9... Read More about TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet.

TIC 278956474: Two close binaries in one young quadruple system, identified by TESS (2020)
Journal Article
Hellier. (2020). TIC 278956474: Two close binaries in one young quadruple system, identified by TESS. Astrophysical Journal, https://doi.org/10.3847/1538-3881/ab9d20

We have identified a quadruple system with two close eclipsing binaries in TESS data. The object is unresolved in Gaia and appears as a single source at parallax 1.08~$\pm$0.01 mas. Both binaries have observable primary and secondary eclipses and wer... Read More about TIC 278956474: Two close binaries in one young quadruple system, identified by TESS.

Publisher Correction: A planet within the debris disk around the pre-main-sequence star AU Microscopii (2020)
Journal Article
Plavchan, P., Barclay, T., Gagné, J., Gao, P., Cale, B., Matzko, W., …Zilberman, P. (2020). Publisher Correction: A planet within the debris disk around the pre-main-sequence star AU Microscopii. Nature, 583(7818), E31-E31. https://doi.org/10.1038/s41586-020-2516-1

Correction to: Nature https://www.nature.com/articles/s41586-020-2400-zPublished online 24 June 2020 In Fig. 3 of this Article, the subscript ‘Sun’ symbols on both axis labels (R☉ and M☉) should have been subscript ‘Earth’ symbols (R⊕ and M⊕), as... Read More about Publisher Correction: A planet within the debris disk around the pre-main-sequence star AU Microscopii.