Search Publications
Masses, revised radii, and a third planet candidate in the 'Inverted' planetary system around TOI-1266
Knutson, Heather; Vanderburg, Andrew; López-Morales, Mercedes +40 more
Is the population of close-in planets orbiting M dwarfs sculpted by thermally driven escape or is it a direct outcome of the planet formation process? A number of recent empirical results strongly suggest the latter. However, the unique architecture of the TOI-1266 system presents a challenge to models of planet formation and atmospheric escape gi…
Study of the fastest classical nova, V1674 Her: photoionization and morpho-kinemetic model analysis
Dubovsky, Pavol A.; Das, Ramkrishna; Ashok, N. M. +2 more
We present the results of the investigation of the nova V1674 Her (2021), recognized as the swiftest classical nova, with t2 ~ 0.90 d. The distance to the nova is estimated to be 4.97 kpc. The mass and radius of the WD are calculated to be ~1.36 M⊙ and ~0.15 R⊕, respectively. Over the course of 1 month following th…
Evolution of helium triplet transits of close-in gas giants orbiting K dwarfs
Vidotto, Aline A.; Dos Santos, Leonardo A.; Driessen, Florian A. +2 more
Atmospheric escape in exoplanets has traditionally been observed using hydrogen Lyman-α and Hα transmission spectroscopy, but more recent detections have utilized the metastable helium triplet at 1083 nm. Since this feature is accessible from the ground, it offers new possibilities for studying atmospheric escape. Our goal is to understand how the…
Beyond the Rotational Deathline: Radio Emission from Ultra-long Period Magnetars
Wadiasingh, Z.; Cooper, A. J.
Motivated by the recent detection of ultralong-period radio transients, we investigate new models of coherent radio emission via low-altitude electron-positron pair production in neutron stars (NSs) beyond rotationally powered curvature radiation deathlines. We find that plastic motion (akin to 'continental drift') and qualitatively similar thermo…
Physical properties of the eclipsing binary KIC 9851944 and analysis of its tidally perturbed p- and g-mode pulsations
Southworth, J.; Van Reeth, T.; Jennings, Z. +1 more
Stars that are both pulsating and eclipsing offer an important opportunity to better understand many of the physical phenomena that occur in stars, because it is possible to measure the pulsation frequencies of stars for which the masses and radii are known precisely and accurately. KIC 9851944 is a double-lined detached eclipsing binary containin…
HELLO project: high-z evolution of large and luminous objects
Kang, Xi; Buck, Tobias; Davis, Benjamin L. +6 more
We present the High-z Evolution of Large and Luminous Objects (HELLO) project, a set of $\sim \!30$ high-resolution cosmological simulations aimed to study Milky Way analogues ($M_\star \sim 10^{10-11}$ ${\mathrm{M}}_{\odot }$) at high redshift ($z\sim [2-4]$). Based on the numerical investigation of a hundred astrophysical objects, HELLO features…
CANUCS: UV and ionizing properties of dwarf star-forming galaxies at z 5-7
Willott, Chris J.; Harshan, Anishya; Martis, Nicholas S. +14 more
The epoch of reionization (EoR) progressed through the emission of ionizing photons from galaxies to their local intergalactic medium. In this work, we characterize the dwarf star-forming galaxies as candidates for the source of ionizing photons that drove EoR. We investigate the ionizing properties and star formation histories of star-forming dwa…
The white dwarf binary pathways survey - X. Gaia orbits for known UV excess binaries
Gänsicke, B. T.; Koester, D.; Rebassa-Mansergas, A. +9 more
White dwarfs with an F, G, or K type companion represent the last common ancestor for a plethora of exotic systems throughout the galaxy, though to this point very few of them have been fully characterized in terms of orbital period and component masses, despite the fact several thousand have been identified. Gaia data release 3 has examined many …
On the origin of accretion bursts in FU Ori
Nayakshin, Sergei; Elbakyan, Vardan
Accretion luminosity of young star FU Ori (FUOR) increased from undetectable levels to hundreds of L⊙ in 1937 and remains nearly as high at the present time. In a recent paper, we showed how Extreme Evaporation (EE) of a young gas giant planet that migrated to a ~10 d orbit around the star may power FUOR. However, our model assumed a po…
Asteroseismic signatures of core magnetism and rotation in hundreds of low-luminosity red giants
Li, Gang; Chaplin, William J.; Davies, Guy R. +6 more
Red giant stars host solar-like oscillations which have mixed character, being sensitive to conditions both in the outer convection zone and deep within the interior. The properties of these modes are sensitive to both core rotation and magnetic fields. While asteroseismic studies of the former have been done on a large scale, studies of the latte…