Search Publications
Gaia Focused Product Release: Radial velocity time series of long-period variables
Prusti, T.; Mazeh, T.; Zucker, S. +403 more
Context. The third Gaia Data Release (DR3) provided photometric time series of more than 2 million long-period variable (LPV) candidates. Anticipating the publication of full radial-velocity data planned with Data Release 4, this Focused Product Release (FPR) provides radial-velocity time series for a selection of LPV candidates with high-quality …
A New Sample of Transient Ultraluminous X-Ray Sources Serendipitously Discovered by Swift/XRT
Fürst, Felix; Middleton, Matthew J.; Walton, Dominic J. +11 more
Ultraluminous X-ray sources (ULXs) are our best laboratories for studying extreme super-Eddington accretion. Most studies of these objects are of relatively persistent sources; however, there is growing evidence to suggest a large fraction of these sources are transient. Here we present a sample of five newly reported transient ULXs in the galaxie…
CO multi-line imaging of nearby galaxies (COMING). XII. CO-to-H2 conversion factor and dust-to-gas ratio
Kobayashi, Masato I. N.; Kuno, Nario; Miyamoto, Yusuke +8 more
We simultaneously measured the spatially resolved CO-to-H2 conversion factor (αCO) and dust-to-gas ratio (DGR) in nearby galaxies on a kiloparsec scale. In this study, we used 12CO(J = 1-0) data obtained by the Nobeyama 45 m radio telescope with H I and dust mass surface densities. We obtained the values of global …
The S-Web Origin of Composition Enhancement in the Slow-to-moderate Speed Solar Wind
Sun, X.; Lynch, B. J.; Lepri, S. T. +3 more
Connecting the solar wind observed throughout the heliosphere to its origins in the solar corona is one of the central aims of heliophysics. The variability in the magnetic field, bulk plasma, and heavy ion composition properties of the slow wind are thought to result from magnetic reconnection processes in the solar corona. We identify regions of…
Solar Radio Spikes and Type IIIb Striae Manifestations of Subsecond Electron Acceleration Triggered by a Coronal Mass Ejection
Kontar, Eduard P.; Vilmer, Nicole; Chen, Xingyao +3 more
Understanding electron acceleration associated with magnetic energy release at subsecond scales presents major challenges in solar physics. Solar radio spikes observed as subsecond, narrow-bandwidth bursts with Δf/f ~ 10-3-10-2 are indicative of a subsecond evolution of the electron distribution. We present a statistical anal…
Multistage Reconnection Powering a Solar Coronal Jet
Teriaca, Luca; Long, David M.; Berghmans, David +5 more
Coronal jets are short-lived eruptive features commonly observed in polar coronal holes and are thought to play a key role in the transfer of mass and energy into the solar corona. We describe unique contemporaneous observations of a coronal blowout jet seen by the Extreme Ultraviolet Imager (EUI) on board the Solar Orbiter (SO) spacecraft and the…
Untangling the Sources of Abundance Dispersion in Low-metallicity Stars
Weinberg, David H.; Johnson, Jennifer A.; Ilyin, Ilya +4 more
We measure abundances of 12 elements (Na, Mg, Si, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni) in a sample of 86 metal-poor (-2 ≲ [Fe/H] ≲ -1) subgiant stars in the solar neighborhood. Abundances are derived from high-resolution spectra taken with the Potsdam Echelle Polarimetric and Spectroscopic Instrument on the Large Binocular Telescope, modeled using i…
Accelerating galaxy winds during the big bang of starbursts
Hayes, Matthew J.
We develop a new method to infer the temporal, geometric, and energetic properties of galaxy outflows, by combining stellar spectral modelling to infer starburst ages, and absorption lines to measure velocities. If winds are accelerated with time during a starburst event, then these two measurements enable us to solve for the wind radius, similarl…
Unveiling the nitrogen-rich massive star in the metal-poor galaxy NGC 4068
Egorov, Oleg V.; Yarovova, Anastasiya D.; Moiseev, Alexei V. +1 more
We report the identification of the unusual emission-line stellar-like object in the nearby low-metallicity ($Z \sim 0.1 \, \mathrm{Z_{\odot }}$) dwarf galaxy NGC 4068. Our observations performed with long-slit spectrograph and Fabry-Perot interferometer demonstrate high velocity dispersion in H α line, presence of He II λ4686Å line and peculiarly…
The Unusual M-dwarf Warm Jupiter TOI-1899 b: Refinement of Orbital and Planetary Parameters
Cochran, William D.; Mahadevan, Suvrath; Wisniewski, John +31 more
TOI-1899 b is a rare exoplanet, a temperate warm Jupiter orbiting an M dwarf, first discovered by Cañas et al. (2020) from a TESS single-transit event. Using new radial velocities (RVs) from the precision RV spectrographs HPF and NEID, along with additional TESS photometry and ground-based transit follow-up, we are able to derive a much more preci…