Search Publications
Searching for solar siblings in APOGEE and Gaia DR2 with N-body simulations
Bovy, Jo; Mackereth, J. Ted; Hunt, Jason A. S. +4 more
We make use of APOGEE and Gaia data to identify stars that are consistent with being born in the same association or star cluster as the Sun. We limit our analysis to stars that match solar abundances within their uncertainties, as they could have formed from the same giant molecular cloud (GMC) as the Sun. We constrain the range of orbital action…
Analysis of eclipsing binaries in multiple stellar systems: the case of V1200 Centauri
Ratajczak, M.; Marques, J. P.; Hełminiak, K. G. +5 more
We present a new analysis of the multiple-star V1200 Centauri based on the most recent observations for this system. We used the photometric observations from the Solaris network and the Transiting Exoplanet Survey Satellite telescope, combined with the new radial velocities from the CHIRON spectrograph and those published in the literature. We co…
A resistive extension for ideal magnetohydrodynamics
Wright, Alex James; Hawke, Ian
We present an extension to the special relativistic, ideal magnetohydrodynamic (MHD) equations, designed to capture effects due to resistivity. The extension takes the simple form of an additional source term that, when implemented numerically, is shown to emulate the behaviour produced by a fully resistive MHD description for a range of initial d…
seestar: Selection functions for spectroscopic surveys of the Milky Way
Everall, Andrew; Das, Payel
Selection functions are vital for understanding the observational biases of spectroscopic surveys. With the wide variety of multiobject spectrographs currently in operation and becoming available soon, we require easily generalizable methods for determining the selection functions of these surveys. Previous work, however, has largely been focused …
First results from MFOSC-P: low-resolution optical spectroscopy of a sample of M dwarfs within 100 parsecs
Homeier, D.; Allard, F.; Kumar, Vipin +4 more
Mt Abu Faint Object Spectrograph and Camera (MFOSC-P) is an in-house-developed instrument for the Physical Research Laboratory (PRL) 1.2 m telescope at Mt Abu, India, commissioned in 2019 February. Here we present the first science results derived from the low-resolution spectroscopy programme of a sample of M dwarfs carried out during the commiss…
SDSS J124043.01+671034.68: the partially burned remnant of a low-mass white dwarf that underwent thermonuclear ignition?
Kepler, S. O.; Raddi, Roberto; Gänsicke, Boris T. +2 more
The white dwarf SDSS J124043.01+671034.68 (SDSS J1240+6710) was previously found to have an oxygen-dominated atmosphere with significant traces of neon, magnesium, and silicon. A possible origin via a violent late thermal pulse or binary interactions has been suggested to explain this very unusual photospheric composition. We report the additional…
The absolute proper motions of the Arches and Quintuplet clusters
van der Marel, Roeland P.; Bellini, Andrea; Libralato, Mattia +2 more
Arches and Quintuplet are two young, massive clusters projected near the Galactic Centre. To date, studies focused on understanding their origin have been based on proper motions (PMs) derived in the clusters' reference frames and required some assumptions about their 3D motion. In this paper, we combine public PM catalogues of these clusters with…
TESS observations of pulsating subdwarf B stars: extraordinarily short-period gravity modes in CD-28° 1974
Reed, M. D.; Jeffery, C. S.; Uzundag, M. +7 more
Transiting Exoplanet Survey Satellite (TESS) observations show CD-28° 1974 to be a gravity(g)-mode-dominated hybrid pulsating subdwarf B (sdBV) star. It shows 13 secure periods that form an ℓ = 1 asymptotic sequence near the typical period spacing. Extraordinarily, these periods lie between 1500 and 3300 s, whereas typical $\ell = 1\, g$ modes in …
A new method of determining brightness and size of cometary nuclei
Paradowski, Mieczyslaw Leszek
This paper presents a new method of determining the brightness and size of cometary nuclei that has been applied to the following 32 observed comets: 2P/Encke, 29P/Schwassmann-Wachmann 1, 102P/Shoemaker 1, 103P/Hartley 2, 168P/Hergenrother, 189P/NEAT, 260P/McNaught, 315P/LONEOS, P/2012 NJ (La Sagra), P/2013 J2 (McNaught), C/2006 S3 (LONEOS), C/200…
From the inner to outer Milky Way: a photometric sample of 2.6 million red clump stars
Ting, Yuan-Sen; Hawkins, Keith; Lucey, Madeline +1 more
Large pristine samples of red clump stars are highly sought after given that they are standard candles and give precise distances even at large distances. However, it is difficult to cleanly select red clumps stars because they can have the same Teff and log g as red giant branch stars. Recently, it was shown that the asteroseismic para…