Search Publications
A 99 minute Double-lined White Dwarf Binary from SDSS-V
Maoz, Dan; Hermes, J. J.; Rix, Hans-Walter +12 more
We report the discovery of SDSS J133725.26+395237.7 (hereafter SDSS J1337+3952), a double-lined white dwarf (WD+WD) binary identified in early data from the fifth-generation Sloan Digital Sky Survey (SDSS-V). The double-lined nature of the system enables us to fully determine its orbital and stellar parameters with follow-up Gemini spectroscopy an…
Radius and Mass Distribution of Ultra-short-period Planets
Uzsoy, Ana Sofía M.; Rogers, Leslie A.; Price, Ellen M.
Ultra-short-period (USP) planets are an enigmatic subset of exoplanets defined by having orbital periods <1 day. It is still not understood how USP planets form, or to what degree they differ from planets with longer orbital periods. Most USP planets have radii <2 R⊕, while planets that orbit further from their star extend to Jupi…
Radio Counterpart Candidates to Unassociated 4FGL-DR2 Sources
Schinzel, F. K.; Bruzewski, S.; Taylor, G. B. +1 more
For the duration of the Fermi Gamma-Ray Space Telescope's mission, approximately one-third of the point sources detected have been noted as "unassociated," meaning that they seem to have no known counterpart at any other wavelength/frequency. This mysterious part of the gamma-ray sky is perhaps one of the largest unknowns in current astronomical p…
A transmission spectrum of the planet candidate WD 1856+534 b and a lower limit to its mass
Alonso, R.; Hollands, M. A.; Castro-Rodríguez, N. +7 more
The cool white dwarf WD 1856+534 was found to be transited by a Jupiter-sized object with a mass at or below 14 MJup. We used the GTC telescope to obtain and analyse the photometry and low-resolution spectroscopy of six transits of WD 1856+534 b, with the intention of deriving the slope of the transmission spectrum. Such a slope, assumi…
Solar wind rotation rate and shear at coronal hole boundaries. Possible consequences for magnetic field inversions
Lavraud, B.; Fargette, N.; Rouillard, A. P. +6 more
Context. In situ measurements by several spacecraft have revealed that the solar wind is frequently perturbed by transient structures that have been interpreted as magnetic folds, jets, waves, and flux ropes that propagate rapidly away from the Sun over a large range of heliocentric distances. Parker Solar Probe (PSP), in particular, has detected …
One Source, Two Source(s): Ribs and Tethers
Knowles, Kenda; Rudnick, Lawrence; Kolokythas, Konstantinos +1 more
We present the unique and challenging case of a radio galaxy in Abell 3266 observed as part of the MeerKAT Galaxy Cluster Legacy Survey. It has quasi-periodic bright patches along the tail which connect to never-before-seen thin transverse extensions, which we call "ribs", reaching up to ∼50 kpc from the central axis of the tail. At a distance of …
Organic Matter in Cometary Environments
McKay, Adam J.; Roth, Nathan X.
Comets contain primitive material leftover from the formation of the Solar System, making studies of their composition important for understanding the formation of volatile material in the early Solar System. This includes organic molecules, which, for the purpose of this review, we define as compounds with C–H and/or C–C bonds. In this review, we…
The evolution of merger fraction of galaxies at z < 0.6 depending on the star formation mode in the AKARI NEP-Wide Field
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +19 more
We study the galaxy merger fraction and its dependence on star formation mode in the 5.4 deg2 of the North Ecliptic Pole-Wide Field. We select 6352 galaxies with AKARI 9 $\mu$m detections, and identify mergers among them using the Gini coefficient and M20 derived from the Subaru/Hyper Suprime-Cam (HSC) optical images. We obta…
Solo dwarfs IV: comparing and contrasting satellite and isolated dwarf galaxies in the Local Group
McConnachie, A. W.; Higgs, C. R.
We compare and contrast the stellar structures of isolated Local Group dwarf galaxies, as traced by their oldest stellar populations, with the satellite dwarf galaxies of the Milky Way and M 31. All Local Group dwarfs with Mv ≤ -6 and µo < 26.5 mag arcsec-2 are considered, taking advantage of measurements …
The Dynamics of the Alfvénic Oval
Keiling, Andreas
The auroral oval is a well-established concept, introduced more than five decades ago. The Alfvénic oval, on the other hand, is a very recent concept, which has been revealed in both observational and numerical studies. This is the first review of the global Alfvénic oval, while also defining primary, secondary and tertiary layers of the Alfvénic …