P. Dufour

Spectroscopic Monitoring of Metal Lines in Polluted White Dwarfs*

Laura K. Rogers, Michael M. Shara, Amy Bonsor, S Xu et autres

Abstract The disruption and accretion of planetary material onto white dwarfs are expected to be inherently dynamic and stochastic, potentially driving variability in the accretion rate and therefore the shape and depth of the photospheric metal absorption lines. This paper presents an …

us, gb, ca (code pays fourni par la source)

Tracing outer planetary systems through white dwarf pollution in wide binaries

Carolina Lizana-Vidal, Claudia Aguilera-Gómez, Laura K. Rogers, Amy Bonsor et autres

White dwarf (WD) atmospheric metal pollution provides strong evidence for the presence of remnant planetary material, and it can be used as an indirect tracer of outer planetary systems. We analyze whether the presence of a wide stellar companion affects the occurrence …

Early Exploration of the Scientific Discovery Space for the Habitable Worlds Observatory

Courtney D. Dressing, D. Adams, E. Alécian, Gagandeep Anand et autres

The Habitable Worlds Observatory (HWO) is a future NASA flagship mission concept identified by the Astro2020 Decadal Survey as the highest priority for large space missions. HWO should conduct "transformative astrophysics" and search for biosignatures in the atmospheres of approximately 25 potentially …

us, fr, br, gb, ch, at, cn, au, ca, es, nl, Afrique du Sud, cl (code pays fourni par la source)

Tracing outer planetary systems through white dwarf pollution in wide binaries

Carolina Lizana-Vidal, Claudia Aguilera-Gómez, Laura K. Rogers, Amy Bonsor et autres

White dwarf (WD) atmospheric metal pollution provides strong evidence for the presence of remnant planetary material and it can be used as an indirect tracer of outer planetary systems. We analyze whether the presence of a wide stellar companion affects the occurrence …

cl, us, gb, ru (code pays fourni par la source)

Spectroscopic Monitoring of Metal Lines in Polluted White Dwarfs

Laura K. Rogers, Michael M. Shara, Amy Bonsor, S Xu et autres

The disruption and accretion of planetary material onto white dwarfs is expected to be inherently dynamic and stochastic, potentially driving variability in the accretion rate and therefore the shape and depth of the photospheric metal absorption lines. This paper presents an 18-year …

us, gb, ru (code pays fourni par la source)

High-velocity Circumstellar Gas Orbiting a White Dwarf Star

Ben Zuckerman, Érika Le Bourdais, B. Klein, P. Dufour et autres

Abstract Numerous white dwarf stars are known to be orbited by disks of gas and dust. To date, broad, ∼300 km s −1 wide, gaseous circumstellar absorption features have only been reported for the already iconic WD 1145+017, where one is witnessing …

us, ca, cl, gb (code pays fourni par la source)

From Hubble to HWO: Bridging the Frontier of White Dwarf Exoplanet Science

Laura K. Rogers, Siyi Xu, Martin Barstow, Simon Blouin et autres

White dwarf stars, the endpoint of stellar evolution for 97% of stars in our Milky Way, offer a unique and powerful window into the bulk elemental composition of rocky exoplanetary bodies. Up to 50% of single white dwarfs are observed with photospheric …

From Hubble to HWO: Bridging the Frontier of White Dwarf Exoplanet Science

Laura K. Rogers, Siyi Xu, Martin Barstow, Simon Blouin et autres

White dwarf stars, the endpoint of stellar evolution for 97% of stars in our Milky Way, offer a unique and powerful window into the bulk elemental composition of rocky exoplanetary bodies. Up to 50% of single white dwarfs are observed with photospheric …

us, gb, ru (code pays fourni par la source)

The MIRI Excesses Around Degenerates (MEAD) Survey. I. A Candidate Cold Brown Dwarf in Orbit Around the Nearby White Dwarf 2MASS J09424023−4637176

Loïc Albert, Sabrina Poulsen, Érika Le Bourdais, John H. Debes et autres

Abstract The MIRI Excesses Around Degenerates Survey is a Cycle 2 James Webb Space Telescope (JWST) survey program designed to image nearby white dwarfs in the mid-IR with the MIRI imaging mode. Only a handful of white dwarfs have previously been observed …

ca, us, gb (code pays fourni par la source)

High Velocity Circumstellar Gas Orbiting a White Dwarf Star

B. Zuckerman, Érika Le Bourdais, B. Klein, P. Dufour et autres

Numerous white dwarf stars are known to be orbited by disks of gas and dust. To date, broad, about 300 km s-1 wide, gaseous circumstellar absorption features have only been reported for the already iconic WD 1145+017, where one is witnessing the …

High Velocity Circumstellar Gas Orbiting a White Dwarf Star

B. Zuckerman, Érika Le Bourdais, B. Klein, P. Dufour et autres

Numerous white dwarf stars are known to be orbited by disks of gas and dust. To date, broad, about 300 km s-1 wide, gaseous circumstellar absorption features have only been reported for the already iconic WD 1145+017, where one is witnessing the …

us, cl, gb, de (code pays fourni par la source)

Oscillation of a Ball on a Concave Surface

Rod Cross, P. Dufour

ca (code pays fourni par la source)