Search Publications
Beyond the Local Volume. I. Surface Densities of Ultracool Dwarfs in Deep HST/WFC3 Parallel Fields
Holwerda, Benne; Burgasser, Adam J.; Ryan, Russell E. +6 more
Ultracool dwarf stars and brown dwarfs provide a unique probe of large-scale Galactic structure and evolution; however, until recently spectroscopic samples of sufficient size, depth, and fidelity have been unavailable. Here, we present the identification of 164 M7-T9 ultracool dwarfs in 0.6 deg2 of deep, low-resolution, near-infrared s…
The VVV survey: Long-period variable stars. I. Photometric catalog of ten VVV/OGLE tiles
Minniti, D.; Zoccali, M.; Rojas-Arriagada, A. +7 more
Context. Long-period variable stars (LPVs) are pulsating red giants, primarily in the asymptotic giant branch phase, and they include both Miras and semi-regular variables (SRVs). Their period-age and period-luminosity relations enable us to trace different stellar populations, as they are intrinsically very bright and cover a wide range in distan…
Callisto's Atmosphere: First Evidence for H2 and Constraints on H2O
Alday, Juan; Johnson, Robert E.; Roth, Lorenz +8 more
We explore the parameter space for the contribution to Callisto's H corona observed by the Hubble Space Telescope from sublimated H2O and radiolytically produced H2 using the Direct Simulation Monte Carlo method. The spatial morphology of this corona produced via photoelectron and magnetospheric electron-impact-induced dissoc…
The white dwarf binary pathways survey - VII. Evidence for a bi-modal distribution of post-mass transfer systems?
Gänsicke, B. T.; Parsons, S. G.; Hernandez, M. S. +5 more
Binary systems consisting of a white dwarf (WD) and a main-sequence companion with orbital periods up to ≈100 d are often thought to be formed through common envelope evolution which is still poorly understood. To provide new observational constraints on the physical processes involved in the formation of these objects, we are conducting a large-s…
Apsidal motion in massive eccentric binaries: The case of CPD-41° 7742, and HD 152218 revisited
Gosset, E.; Sterken, C.; Nazé, Y. +2 more
Context. This paper is part of a study of the apsidal motion in close eccentric massive binary systems, which aims to constrain the internal structure of the stars. We focus on the binary CPD-41° 7742 and briefly revisit the case of HD 152218.
Aims: Independent studies of CPD-41° 7742 in the past showed large discrepancies in the longitude of…
CLASSY V: The Impact of Aperture Effects on the Inferred Nebular Properties of Local Star-forming Galaxies
Martin, Crystal L.; Brinchmann, Jarle; Charlot, Stéphane +23 more
Strong nebular emission lines are an important diagnostic tool for tracing the evolution of star-forming galaxies across cosmic time. However, different observational setups can affect these lines, and the derivation of the physical nebular properties. We analyze 12 local star-forming galaxies from the COS Legacy Spectroscopy SurveY (CLASSY) to as…
SOFIA Observations of Far-IR Fine-structure Lines in Galaxies to Measure Metallicity
Spinoglio, Luigi; Fernández-Ontiveros, Juan Antonio; Malkan, Matthew A. +8 more
We present new and archival SOFIA FIFI-LS far-IR spectroscopic observations of the [O III] 52 µm and/or the [N III] 57 µm lines of 25 local galaxies. Including 31 other galaxies from Herschel-PACS, we discuss a local sample of 47 galaxies, including the H II galaxies, luminous IR galaxies, low-metallicity dwarfs, and Seyfert nuclei. An…
Influence of Large-scale Interplanetary Structures on the Propagation of Solar Energetic Particles: The Multispacecraft Event on 2021 October 9
Lario, D.; Palmerio, E.; Vainio, R. +18 more
An intense solar energetic particle (SEP) event was observed on 2021 October 9 by multiple spacecraft distributed near the ecliptic plane at heliocentric radial distances R ≲ 1 au and within a narrow range of heliolongitudes. A stream interaction region (SIR), sequentially observed by Parker Solar Probe (PSP) at R = 0.76 au and 48° east from Earth…
The global distribution and morphologic characteristics of fan-shaped sedimentary landforms on Mars
Wilson, Sharon A.; Howard, Alan D.; Morgan, Alexander M.
Fan-shaped sedimentary landforms on Mars are important geomorphic markers of past water flow and characterizing the distribution and morphology of these features can yield insights into the planet's climatic evolution. We present a new database of 1501 martian fan-shaped sedimentary landforms that builds upon previous surveys and uses Context Came…
Von Zeipel - Lidov - Kozai cycles in action: Kepler triples with eclipse depth variations: KICs 6964043, 5653126, 5731312, and 8023317
Mitnyan, T.; Moe, M.; Toonen, S. +3 more
We report the results of the photodynamical analyses of four compact, tight triple stellar systems, KICs 6964043, 5653126, 5731312, and 8023317, based largely on Kepler and TESS data. All systems display remarkable eclipse timing and eclipse depth variations, the latter implying a non-aligned outer orbit. Moreover, KIC 6964043 is also a triply ecl…