Search Publications
Testing theories of accretion and gravity with super-extremal Kerr discs
Ingram, Adam; Mummery, Andrew; Balbus, Steven
Fitting the thermal continuum emission of accreting black holes observed across X-ray bands represents one of the principle means of constraining the properties (mass and spin) of astrophysical black holes. Recent 'continuum fitting' studies of Galactic X-ray binaries in the soft state have found best-fitting dimensionless spin values which run in…
Dynamics and potential origins of decimeter-sized particles around comet 67P/Churyumov-Gerasimenko
Agarwal, Jessica; Grieger, Björn; Marschall, Raphael +2 more
Context. One of the primary goals of the European Space Agency's Rosetta mission to comet 67P/Churyumov-Gerasimenko was to investigate the mechanisms responsible for cometary activity.
Aims: Our aim is to learn more about the ejection process of large refractory material by studying the dynamics of decimeter-sized dust particles in the coma o…
Using autoencoders and deep transfer learning to determine the stellar parameters of 286 CARMENES M dwarfs
Caballero, J. A.; Montes, D.; Passegger, V. M. +9 more
Context. Deep learning (DL) techniques are a promising approach among the set of methods used in the ever-challenging determination of stellar parameters in M dwarfs. In this context, transfer learning could play an important role in mitigating uncertainties in the results due to the synthetic gap (i.e. difference in feature distributions between …
ALMA follow-up of 3000 red-Herschel galaxies: the nature of extreme submillimetre galaxies
Zavala, Jorge A.; Hughes, David H.; Aretxaga, Itziar +2 more
We present the analysis of over 3000 red-Herschel sources (
A pilot search for MeV gamma-ray emission from five galaxy clusters using archival COMPTEL data
Manna, Siddhant; Desai, Shantanu
We search for MeV gamma-ray emission between 0.75–30 MeV from five galaxy clusters, viz. Coma, VIRGO, SPT-CL J2012-5649, Bullet, and El Gordo, using archival data from the COMPTEL telescope. For this purpose we use three search templates: point source, radial disk and radial Gaussian. We do not detect any signals from Coma, SPT-CL J2012-5649, Bull…
Every Data Point Counts: Stellar Flares as a Case Study of Atmosphere-aided Studies of Transients in the LSST Era
Davenport, James R. A.; Bosch, James; Graham, Melissa L. +9 more
Due to their short timescale, stellar flares are a challenging target for the most modern synoptic sky surveys. The upcoming Vera C. Rubin Legacy Survey of Space and Time (LSST), a project designed to collect more data than any precursor survey, is unlikely to detect flares with more than one data point in its main survey. We developed a methodolo…
Phobos photometric properties from Mars Express HRSC observations
Barucci, M. A.; Fornasier, S.; Matz, K. -D. +5 more
Aims: This study aims to analyze Phobos' photometric properties using Mars Express mission observations to support the Martian Moons exploration mission (MMX) devoted to the investigation of the Martian system and to the return of Phobos samples.
Methods: We analyzed resolved images of Phobos acquired between 2004 and 2022 by the High Re…
Gliese 12 b, a temperate Earth-sized planet at 12 parsecs discovered with TESS and CHEOPS
Vanderburg, Andrew; López-Morales, Mercedes; Latham, David W. +33 more
We report on the discovery of Gliese 12 b, the nearest transiting temperate, Earth-sized planet found to date. Gliese 12 is a bright (V = 12.6 mag, K = 7.8 mag) metal-poor M4V star only 12.162 ± 0.005 pc away from the Solar system with one of the lowest stellar activity levels known for M-dwarfs. A planet candidate was detected by TESS based on on…
First Constraints on the Interstellar Medium Conditions of a Low-mass, Highly Obscured z = 4.27 Main-sequence Galaxy
Murphy, Eric; McKinney, Jed; Whitaker, Katherine E. +4 more
We present the molecular gas content and interstellar medium conditions of MACS J0717_Az9, a strong gravitationally lensed z = 4.273, M * ≃ 2 × 109 M ⊙ star-forming galaxy with an unusually high (∼80%) obscured star formation fraction. We detect CO (4–3) in two independent lensed images, as well as [N II] 205 &micr…
Exploring the high-density reflection model for the soft excess in RBS 1124
Stern, D.; Fabian, A. C.; Hardcastle, M. J. +13 more
'Bare' active galactic nuclei (AGN) are a subclass of Type 1 AGN that show little or no intrinsic absorption. They offer an unobscured view of the central regions of the AGN and therefore serve as ideal targets to study the relativistic reflection features originating from the innermost regions of the accretion disc. We present a detailed broad-ba…