All Outputs (261)

The TESS light curve of AI Phoenicis (2020)
Journal Article
Maxted, P. F. L., Gaulme, P., Graczyk, D., Hełminiak, K. G., Johnston, C., Orosz, J. A., …Chaplin, W. J. (2020). The TESS light curve of AI Phoenicis. Monthly Notices of the Royal Astronomical Society, 498(1), 332-343. https://doi.org/10.1093/mnras/staa1662

Accurate masses and radii for normal stars derived from observations of detached eclipsing binary stars are of fundamental importance for testing stellar models and may be useful for calibrating free parameters in these model if the masses and radii... Read More about The TESS light curve of AI Phoenicis.

Large-scale changes of the cloud coverage in the e Indi Ba,Bb system (2020)
Journal Article
Hitchcock, J. A., Helling, C., Scholz, A., Hodosan, G., Dominik, M., Hundertmark, M., …Collaboration, T. M. (2020). Large-scale changes of the cloud coverage in the e Indi Ba,Bb system. Monthly Notices of the Royal Astronomical Society, 495(4), 3881-3899. https://doi.org/10.1093/mnras/staa1344

We present the results of 14 nights of I-band photometric monitoring of the nearby brown dwarf binary, e Indi Ba,Bb. Observations were acquired over 2 months, and total close to 42 hours of coverage at a typically high cadence of 1.4 minutes. At a se... Read More about Large-scale changes of the cloud coverage in the e Indi Ba,Bb system.

Discovery of ß Cep pulsations in the eclipsing binary V453 Cygni (2020)
Journal Article
Southworth, J., Bowman, D. M., Tkachenko, A., & Pavlovski, K. (2020). Discovery of ß Cep pulsations in the eclipsing binary V453 Cygni. Monthly Notices of the Royal Astronomical Society: Letters, 497(1), L19–L23. https://doi.org/10.1093/mnrasl/slaa091

V453 Cyg is an eclipsing binary containing 14 and 11 $\, \rm M_ødot$ stars in an eccentric short-period orbit. We have discovered ß Cep-type pulsations in this system using Transiting Exoplanet Survey Satellite data. We identify seven significant pul... Read More about Discovery of ß Cep pulsations in the eclipsing binary V453 Cygni.

The mass discrepancy in intermediate- and high-mass eclipsing binaries: The need for higher convective core masses (2020)
Journal Article
Tkachenko, A., Pavlovski, K., Johnston, C., Pedersen, M., Michielsen, M., Bowman, D., …Aerts, C. (2020). The mass discrepancy in intermediate- and high-mass eclipsing binaries: The need for higher convective core masses. Astronomy and Astrophysics, 637, Article A60. https://doi.org/10.1051/0004-6361/202037452

Context. Eclipsing, spectroscopic double-lined binary star systems are excellent laboratories for calibrating theories of stellar interior structure and evolution. Their precise and accurate masses and radii measured from binary dynamics offer model-... Read More about The mass discrepancy in intermediate- and high-mass eclipsing binaries: The need for higher convective core masses.

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., …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 multiplicity study of transiting exoplanet host stars: II. Revised properties of transiting planetary systems with companions (2020)
Journal Article
Southworth, J., Bohn, A., Kenworthy, M., Ginski, C., & Mancini, L. (2020). A multiplicity study of transiting exoplanet host stars: II. Revised properties of transiting planetary systems with companions. Astronomy & Astrophysics, 635, Article A74. https://doi.org/10.1051/0004-6361/201937334

Context. Binarity is a widespread phenomenon around solar-type stars, including the host stars of transiting extrasolar planets. Aims. We performed a detailed study of six transiting planetary systems with relatively bright stars close enough to a... Read More about A multiplicity study of transiting exoplanet host stars: II. Revised properties of transiting planetary systems with companions.

A multiplicity study of transiting exoplanet host stars I. High-contrast imaging with VLT/SPHERE (2020)
Journal Article
Bohn, A., Southworth, J., Ginski, C., Kenworthy, M., Maxted, P., & Evans, D. (2020). A multiplicity study of transiting exoplanet host stars I. High-contrast imaging with VLT/SPHERE. Astronomy & Astrophysics, 635, Article A73. https://doi.org/10.1051/0004-6361/201937127

Context. Many main-sequence stars are part of multiple systems. The effect of stellar multiplicity on planet formation and migration, however, is poorly understood. Aims. We study the multiplicity of stars hosting known transiting extra-solar plan... Read More about A multiplicity study of transiting exoplanet host stars I. High-contrast imaging with VLT/SPHERE.

Spitzer Microlensing Parallax Reveals Two Isolated Stars in the Galactic Bulge (2020)
Journal Article
Zang, W., Shvartzvald, Y., Wang, T., Udalski, A., Lee, C., Sumi, T., …The MiNDSTEp Collaboration. (in press). Spitzer Microlensing Parallax Reveals Two Isolated Stars in the Galactic Bulge. Astrophysical Journal, 891(1), 3. https://doi.org/10.3847/1538-4357/ab6ff8

We report the mass and distance measurements of two single-lens events from the 2017 Spitzer microlensing campaign. The ground-based observations yield the detection of finite-source effects, and the microlens parallaxes are derived from the joint an... Read More about Spitzer Microlensing Parallax Reveals Two Isolated Stars in the Galactic Bulge.

OGLE-2013-BLG-0911Lb: A Secondary on the Brown-dwarf Planet Boundary around an M Dwarf (2020)
Journal Article
Miyazaki, S., Sumi, T., Bennett, D. P., Udalski, A., Shvartzvald, Y., Street, R., …Verma, P. (2020). OGLE-2013-BLG-0911Lb: A Secondary on the Brown-dwarf Planet Boundary around an M Dwarf. Astronomical Journal, 159(2), Article 76. https://doi.org/10.3847/1538-3881/ab64de

We present the analysis of the binary-lens microlensing event OGLE-2013-BLG-0911. The best-fit solutions indicate the binary mass ratio of q ≃ 0.03, which differs from that reported in Shvartzvald et al. The event suffers from the well-known close/wi... Read More about OGLE-2013-BLG-0911Lb: A Secondary on the Brown-dwarf Planet Boundary around an M Dwarf.

The highly inflated giant planet WASP-174b (2020)
Journal Article
Mancini, L., Sarkis, P., Henning, T., Bakos, G., Bayliss, D., Bento, J., …Tan, T. (2020). The highly inflated giant planet WASP-174b. Astronomy & Astrophysics, 633, Article A30. https://doi.org/10.1051/0004-6361/201936532

The transiting exoplanetary system WASP-174 was reported to be composed by a main-sequence F star (V = 11.8 mag) and a giant planet, WASP-174b (orbital period P-orb = 4.23 days). However only an upper limit was placed on the planet mass (

OGLE-2015-BLG-1649Lb: A Gas Giant Planet around a Low-mass Dwarf (2019)
Journal Article
Nagakane, M., Lee, C., Koshimoto, N., Suzuki, D., Udalski, A., Beaulieu, J., …Rahvar, S. (2019). OGLE-2015-BLG-1649Lb: A Gas Giant Planet around a Low-mass Dwarf. Astronomical Journal, 158(5), Article 212. https://doi.org/10.3847/1538-3881/ab4881

We report the discovery of an exoplanet from the analysis of the gravitational microlensing event OGLE-2015-BLG-1649 that challenges the core accretion model of planet formation and appears to support the disk instability model. The planet/host-star... Read More about OGLE-2015-BLG-1649Lb: A Gas Giant Planet around a Low-mass Dwarf.

Transit timing variations in the WASP-4 planetary system (2019)
Journal Article
Southworth, J., Dominik, M., Jørgensen, U. G., Andersen, M. I., Bozza, V., Burgdorf, M. J., …von Essen, C. (2019). Transit timing variations in the WASP-4 planetary system. Monthly Notices of the Royal Astronomical Society, 490(3), 4230 - 4236. https://doi.org/10.1093/mnras/stz2602

Transits in the planetary system WASP-4 were recently found to occur 80 s earlier than expected in observations from the TESS satellite. We present 22 new times of mid-transit that confirm the existence of transit timing variations, and are well fitt... Read More about Transit timing variations in the WASP-4 planetary system.

OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing (2019)
Journal Article
Li, S., Zang, W., Udalski, A., Shvartzvald, Y., Huber, D., Lee, C., …Hill, K. (2019). OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing. Monthly Notices of the Royal Astronomical Society, 488(3), 3308-3323. https://doi.org/10.1093/mnras/stz1873

We present the analysis of the event OGLE-2017-BLG-1186 from the 2017 Spitzer microlensing campaign. This is a remarkable microlensing event because its source is photometrically bright and variable, which makes it possible to perform an asteroseismi... Read More about OGLE-2017-BLG-1186: first application of asteroseismology and Gaussian processes to microlensing.

The EBLM Project VI. The mass and radius of five low-mass stars in F+M binaries discovered by the WASP survey (2019)
Journal Article
Gill, S., Maxted, P., Evans, J., Evans, D., Smalley, B., Gary, B., …West, R. (2019). The EBLM Project VI. The mass and radius of five low-mass stars in F+M binaries discovered by the WASP survey. Astronomy & Astrophysics, 626, Article A119. https://doi.org/10.1051/0004-6361/201833054

Some M-dwarfs around F-/G-type stars have been measured to be hotter and larger than predicted by stellar evolution models. Inconsistencies between observations and models need addressing with more mass, radius and luminosity measurements of low-mass... Read More about The EBLM Project VI. The mass and radius of five low-mass stars in F+M binaries discovered by the WASP survey.

An analysis of binary microlensing event OGLE-2015-BLG-0060 (2019)
Journal Article
Tsapras, Y., Cassan, A., Ranc, C., Bachelet, E., Street, R., Udalski, A., …collaboration, T. M. (2019). An analysis of binary microlensing event OGLE-2015-BLG-0060. Monthly Notices of the Royal Astronomical Society, 487(4), 4603 - 4614. https://doi.org/10.1093/mnras/stz1404

We present the analysis of stellar binary microlensing event OGLE-2015-BLG-0060 based on observations obtained from 13 different telescopes. Intensive coverage of the anomalous parts of the light curve was achieved by automated follow-up observations... Read More about An analysis of binary microlensing event OGLE-2015-BLG-0060.

SpUpNIC (Spectrograph Upgrade: Newly Improved Cassegrain): a versatile and efficient low- to medium-resolution, long-slit spectrograph on the South African Astronomical Observatory's 1.9-m telescope (2019)
Journal Article
Crause, L. A., Gilbank, D., van Gend, C., Worters, H. L., Sass, C., Kotze, E. J., …Burleigh, M. (2019). SpUpNIC (Spectrograph Upgrade: Newly Improved Cassegrain): a versatile and efficient low- to medium-resolution, long-slit spectrograph on the South African Astronomical Observatory's 1.9-m telescope. Journal of Astronomical Telescopes, Instruments, and Systems (JATIS), 5(2), Article 024007. https://doi.org/10.1117/1.jatis.5.2.024007

We report on the extensively upgraded Cassegrain spectrograph on the South African Astronomical Observatory (SAAO) 1.9-m telescope. The introduction of new collimator and camera optics, a new detector and controller, a rear-of-slit viewing camera to... Read More about SpUpNIC (Spectrograph Upgrade: Newly Improved Cassegrain): a versatile and efficient low- to medium-resolution, long-slit spectrograph on the South African Astronomical Observatory's 1.9-m telescope.

Qatar Exoplanet Survey: Qatar-8b, 9b, and 10b—A Hot Saturn and Two Hot Jupiters (2019)
Journal Article
Alsubai, K., Tsvetanov, Z. I., Pyrzas, S., Latham, D. W., Bieryla, A., Eastman, J., …Daassou, A. (2019). Qatar Exoplanet Survey: Qatar-8b, 9b, and 10b—A Hot Saturn and Two Hot Jupiters. Astronomical Journal, 157(6), 224 - 224. https://doi.org/10.3847/1538-3881/ab19bc

In this paper we present three new extrasolar planets from the Qatar Exoplanet Survey. Qatar-8b is a hot Saturn, with M P = 0.37 M J and R P = 1.3 R J, orbiting a solar-like star every P orb = 3.7 days. Qatar-9b is a hot Jupiter with a mass of M P =... Read More about Qatar Exoplanet Survey: Qatar-8b, 9b, and 10b—A Hot Saturn and Two Hot Jupiters.

OGLE-2018-BLG-0022: A Nearby M-dwarf Binary (2019)
Journal Article
Street, R., Bachelet, E., Tsapras, Y., Hundertmark, M., Bozza, V., Dominik, M., …Tregloan-Reed, J. (2019). OGLE-2018-BLG-0022: A Nearby M-dwarf Binary. Astronomical Journal, 157(6), Article 215. https://doi.org/10.3847/1538-3881/ab1538

We report observations of the binary microlensing event OGLE-2018-BLG-0022, provided by the Robotic Observations of Microlensing Events (ROME)/Reactive Event Assessment (REA) Survey, which indicate that the lens is a low-mass binary star consisting o... Read More about OGLE-2018-BLG-0022: A Nearby M-dwarf Binary.

Spectroscopic confirmation of the binary nature of the hybrid pulsator KIC 5709664 found with the frequency modulation method (2019)
Journal Article
Derekas, A., Murphy, S. J., Dálya, G., Szabó, R., Borkovits, T., Bókon, A., …Mészáros, S. (2019). Spectroscopic confirmation of the binary nature of the hybrid pulsator KIC 5709664 found with the frequency modulation method. Monthly Notices of the Royal Astronomical Society, 486(2), 2129-2136. https://doi.org/10.1093/mnras/stz875

We started a program to search for companions around hybrid δ Sct/γ Dor stars with the frequency modulation method using Kepler data. Our best candidate was KIC 5709664, where we could identify Fourier peaks with sidelobes, suggesting binary orbital... Read More about Spectroscopic confirmation of the binary nature of the hybrid pulsator KIC 5709664 found with the frequency modulation method.

Physical properties and transmission spectrum of the WASP-74 planetary system from multiband photometry (2019)
Journal Article
Mancini, L., Southworth, J., Mollière, P., Tregloan-Reed, J., Juvan, I. G., Chen, G., …Wertz, O. (2019). Physical properties and transmission spectrum of the WASP-74 planetary system from multiband photometry. Monthly Notices of the Royal Astronomical Society, 485(4), 5168-5179. https://doi.org/10.1093/mnras/stz661

We present broad-band photometry of 11 planetary transits of the hot Jupiter WASP-74 b, using three medium-class telescopes and employing the telescope-defocusing technique. Most of the transits were monitored through I filters and one was simultaneo... Read More about Physical properties and transmission spectrum of the WASP-74 planetary system from multiband photometry.