All Outputs (155)

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., Thao, P. C., Hawkins, K., Wood, M. L., Rizzuto, A. C., Soubkiou, A., Tofflemire, B. M., Zhou, G., Crossfield, I. J. M., Pearce, L. A., Collins, K. A., Conti, D. M., Tan, T.-G., Villeneuva, S., Spencer, A., …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., Dragomir, D., Quinn, S., Feliz, D., Stassun, K., Crossfield, I. J. M., Berardo, D. A., Latham, D. W., Tieu, B., Anglada-Escudé, G., Ricker, G., Vanderspek, R., Seager, S., Winn, J. N., Jenkins, J. M., …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.

Two Intermediate-mass Transiting Brown Dwarfs from the TESS Mission (2020)
Journal Article
Carmichael, T. W., Quinn, S. N., Mustill, A. J., Huang, C., Zhou, G., Persson, C. M., Nielsen, L. D., Collins, K. A., Ziegler, C., Collins, K. I., Rodriguez, J. E., Shporer, A., Brahm, R., Mann, A. W., Bouchy, F., Fridlund, M., Stassun, K. G., Hellier, C., Seidel, J. V., Stalport, M., …Latham, D. W. (in press). Two Intermediate-mass Transiting Brown Dwarfs from the TESS Mission. Astronomical Journal, 160(1), 53. https://doi.org/10.3847/1538-3881/ab9b84

We report the discovery of two intermediate-mass transiting brown dwarfs (BDs), TOI-569b and TOI-1406b, from NASA's Transiting Exoplanet Survey Satellite mission. TOI-569b has an orbital period of P = 6.55604 ± 0.00016 days, a mass of Mb = 64.1 ± 1.9... Read More about Two Intermediate-mass Transiting Brown Dwarfs from the TESS Mission.

A planet within the debris disk around the pre-main-sequence star AU Microscopii. (2020)
Journal Article
Hellier. (2020). A planet within the debris disk around the pre-main-sequence star AU Microscopii. Nature, 497 - 500. https://doi.org/10.1038/s41586-020-2400-z

AU Microscopii (AU Mic) is the second closest pre-main-sequence star, at a distance of 9.79 parsecs and with an age of 22 million years1. AU Mic possesses a relatively rare2 and spatially resolved3 edge-on debris disk extending from about 35 to 210 a... Read More about A planet within the debris disk around the pre-main-sequence star AU Microscopii..

Two Transiting Hot Jupiters from the WASP Survey: WASP-150b and WASP-176b (2020)
Journal Article
Cooke, B. F., Pollacco, D., Almleaky, Y., Barkaoui, K., Benkhaldoun, Z., Blake, J. A., Bouchy, F., Boumis, P., Brown, D., Bruni, I., Burdanov, A., Collier Cameron, A., Chote, P., Daassou, A., D'ago, G., Dalal, S., Damasso, M., Delrez, L., Doyle, A., Ducrot, E., …Alikakos, J. (2020). Two Transiting Hot Jupiters from the WASP Survey: WASP-150b and WASP-176b. Astronomical Journal, 159(6), Article 255. https://doi.org/10.3847/1538-3881/ab88db

We report the discovery of two transiting exoplanets from the WASP survey, WASP-150b and WASP-176b. WASP-150b is an eccentric (e = 0.38) hot Jupiter on a 5.6 day orbit around a V = 12.03, F8 main-sequence host. The host star has a mass and radius of... Read More about Two Transiting Hot Jupiters from the WASP Survey: WASP-150b and WASP-176b.

A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESS (2020)
Journal Article
Hellier. (2020). A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESS. Astronomy and Astrophysics, https://doi.org/10.1051/0004-6361/201937179

We report the detection of a transiting super-Earth-sized planet (R = 1.39 ± 0.09 R?) in a 1.4-day orbit around L 168-9 (TOI-134), a bright M1V dwarf (V = 11, K = 7.1) located at 25.15 ± 0.02 pc. The host star was observed in the first sector of the... Read More about A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESS.

HATS-47b, HATS-48Ab, HATS-49b and HATS-72b: Four Warm Giant Planets Transiting K Dwarfs (2020)
Journal Article
Hellier. (2020). HATS-47b, HATS-48Ab, HATS-49b and HATS-72b: Four Warm Giant Planets Transiting K Dwarfs. Astronomical Journal, https://doi.org/10.3847/1538-3881/ab7821

We report the discovery of four transiting giant planets around K dwarfs. The planets HATS-47b, HATS-48Ab, HATS49b, and HATS-72b have masses of 0.369+ 0.0210.031MJ, 0.243+ 0.0300.022 MJ, 0.353+ 0.0270.038 MJ, and 0.1254. 0.0039 MJ, respectively, and... Read More about HATS-47b, HATS-48Ab, HATS-49b and HATS-72b: Four Warm Giant Planets Transiting K Dwarfs.

LHS 1815b: The First Thick-disk Planet Detected by TESS (2020)
Journal Article
Gan, T., Shporer, A., Livingston, J. H., Collins, K. A., Mao, S., Trani, A. A., Gandolfi, D., Hirano, T., Luque, R., Stassun, K. G., Ziegler, C., Howell, S. B., Hellier, C., Irwin, J. M., Winters, J. G., Anderson, D. R., Briceño, C., Law, N., Mann, A. W., Bonfils, X., …Rojas-Ayala, B. (in press). LHS 1815b: The First Thick-disk Planet Detected by TESS. Astronomical Journal, 159(4), 160. https://doi.org/10.3847/1538-3881/ab775a

We report the first discovery of a thick-disk planet, LHS 1815b (TOI-704b, TIC 260004324), detected in the Transiting Exoplanet Survey Satellite (TESS) survey. LHS 1815b transits a bright (V = 12.19 mag, K = 7.99 mag) and quiet M dwarf located 29.87... Read More about LHS 1815b: The First Thick-disk Planet Detected by TESS.

GJ 1252 b: A 1.2 R? Planet Transiting an M3 Dwarf at 20.4 pc (2020)
Journal Article
Hellier. (2020). GJ 1252 b: A 1.2 R? Planet Transiting an M3 Dwarf at 20.4 pc. Astrophysical Journal, https://doi.org/10.3847/2041-8213/ab7020

We report the discovery of GJ 1252 b, a planet with a radius of 1.193 ± 0.074 and an orbital period of 0.52 days around an M3-type star (0.381 ± 0.019 , 0.391 ± 0.020 ) located 20.385 ± 0.019 pc away. We use Transiting Exoplanet Survey Satellite (TES... Read More about GJ 1252 b: A 1.2 R? Planet Transiting an M3 Dwarf at 20.4 pc.