Search Publications
First spiral arm detection using dynamical mass measurements of the Milky Way disk
Widmark, Axel; Naik, Aneesh P.
We applied the vertical Jeans equation to the Milky Way disk in order to study non-axisymmetric variations in the thin disk surface density. We divided the disk plane into area cells with a 100 pc grid spacing and used four separate subsets of the Gaia DR3 stars, defined by cuts in absolute magnitude, that reach distances up to 3 kpc. The vertical…
Magnetic origin of the discrepancy between stellar limb-darkening models and observations
Solanki, Sami K.; Seager, Sara; Shapiro, Alexander I. +8 more
Stars appear darker at their limbs than at their disk centres because at the limb we are viewing the higher and cooler layers of stellar photospheres. Yet, limb darkening derived from state-of-the-art stellar atmosphere models systematically fails to reproduce recent transiting exoplanet light curves from the Kepler, TESS and JWST telescopes—stell…
JOYS+ study of solid-state 12C/13C isotope ratios in protostellar envelopes: Observations of CO and CO2 ice with the James Webb Space Telescope
van Dishoeck, E. F.; Nazari, P.; Rocha, W. R. M. +12 more
Context. The carbon isotope ratio is a powerful tool for studying the evolution of stellar systems due to its sensitivity to the local chemical environment. Recent detections of CO isotopologs in disks and exoplanet atmospheres revealed a high variability in the isotope abundance, ponting towards significant fractionation in these systems. In orde…
Discovery of four new EL CVn-type binaries in the Gaia eclipsing binaries
Wang, Kun; Ren, Anbing; Peng, Yuhui
In this paper, we performed a search for EL CVn-type binaries based on the Gaia and TESS data. Through the combination of the Gaia DR3 eclipsing binary catalogue and the Gaia DR3 spectroscopic binary catalogue, we have identified 13 stars exhibiting EL CVn-like characteristics. Among these stars, nine have already been identified as EL CVn binarie…
Investigating the orbital evolution of the eccentric HMXB GX 301-2 using long-term X-ray light curves
Paul, Biswajit; Kumar, Manish; Rana, Vikram +1 more
We report the orbital decay rate of the high-mass X-ray binary GX 301-2 from an analysis of its long-term X-ray light curves and pulsed flux histories from CGRO/BATSE, RXTE/ASM, Swift/BAT, Fermi/GBM, and MAXI by timing the pre-periastron flares over a span of almost 30 yr. The time of arrival of the pre-periastron flares exhibits an energy depende…
INTEGRAL/IBIS polarization detection in the hard and soft intermediate states of Swift J1727.8−1613
Rodriguez, J.; Wilms, J.; Laurent, P. +5 more
Aims: Soft γ-ray emission (100 keV-10 MeV) has previously been detected in the hard state of several microquasars. In some sources, this emission was found to be highly polarized and was suggested to be emitted at the base of the jet. Until now, no γ-ray polarization had been found in any other state.
Methods: Using INTEGRAL/IBIS, we stu…
TESS Investigation—Demographics of Young Exoplanets (TI-DYE). II. A Second Giant Planet in the 17 Myr System HIP 67522
Vanderburg, Andrew; Collins, Karen A.; Seager, Sara +13 more
The youngest (<50 Myr) planets are vital to understand planet formation and early evolution. The 17 Myr system HIP 67522 is already known to host a giant (≃10R ⊕) planet on a tight orbit. In their discovery paper, Rizzuto et al. reported a tentative single-transit detection of an additional planet in the system using TESS. Here, we r…
ViCTORIA project: The LOFAR view of environmental effects in Virgo cluster star-forming galaxies
Boselli, A.; Brüggen, M.; Ignesti, A. +5 more
Context. Environmental effects such as ram pressure stripping (RPS) shape the evolution of galaxies in dense regions.
Aims: We used the nearby Virgo cluster as a laboratory to study the environmental effects on the nonthermal components of star-forming galaxies.
Methods: We constructed a sample of 17 RPS galaxies in the Virgo cluster and…
XLSSC 122 caught in the act of growing up: Spatially resolved SZ observations of a z = 1.98 galaxy cluster
Bond, J. R.; Partridge, B.; Popping, G. +18 more
Context. How protoclusters evolved from sparse galaxy overdensities to mature galaxy clusters is still not well understood. In this context, detecting and characterizing the hot intracluster medium (ICM) at high redshifts (z ∼ 2) is key to understanding how the continuous accretion from the filamentary large-scale structure and the mergers along i…
A Sample of Compact Object Candidates in Single-lined Spectroscopic Binaries from LAMOST Medium-resolution Survey
Gu, Wei-Min; Yi, Tuan; Zhang, Zhi-Xiang +3 more
The stellar spectra from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) medium-resolution survey can be used to search for compact objects in binaries. The LAMOST Data Release 10 catalog includes >980,000 targets with multiple medium-resolution spectra. We select the targets with large or rapid radial-velocity variation,…