Search Publications
Current Challenges in Cepheid Distance Calibrations Using Gaia Early Data Release 3
Madore, Barry F.; Freedman, Wendy L.; Lee, Abigail J. +1 more
Using parallaxes from Gaia Early Data Release 3 (EDR3), we determine multi-wavelength BVI c , JHK s , and [3.6] and [4.5] micron absolute magnitudes for 37 nearby Milky Way Cepheids, covering the period range between 5 and 60 days. We apply these period-luminosity relations to Cepheids in the Large and Small Magellanic Clou…
AGN impact on the molecular gas in galactic centres as probed by CO lines
Vallini, Livia; Mingozzi, Matilde; Vignali, Cristian +5 more
We present a detailed analysis of the X-ray, infrared, and carbon monoxide (CO) emission for a sample of 35 local (z ≤ 0.15), active (LX ≥ 1042 erg s-1) galaxies. Our goal is to infer the contribution of far-ultraviolet (FUV) radiation from star formation (SF), and X-ray radiation from the active galactic nuclei (A…
Turbulence in the Outer Heliosphere
Zank, Gary P.; Adhikari, Laxman; Zhao, Lingling +9 more
The solar wind (SW) and local interstellar medium (LISM) are turbulent media. Their interaction is governed by complex physical processes and creates heliospheric regions with significantly different properties in terms of particle populations, bulk flow and turbulence. Our knowledge of the solar wind turbulence nature and dynamics mostly relies o…
TOI-3884 b: A rare 6-RE planet that transits a low-mass star with a giant and likely polar spot
Bouchy, F.; Bonfils, X.; Ciardi, D. R. +19 more
The Transiting Exoplanet Survey Satellite mission identified a deep and asymmetric transit-like signal with a periodicity of 4.5 days orbiting the M4 dwarf star TOI-3884. The signal has been confirmed by follow-up observations collected by the ExTrA facility and Las Cumbres Observatory Global Telescope, which reveal that the transit is chromatic. …
Detection of 2460 double-lined spectroscopic binary candidates in the LAMOST-MRS using projected rotational velocities and a binary spectral model
Han, Zhanwen; Kovalev, Mikhail; Chen, Xuefei
We present a new method for the detection of double-lined spectroscopic binaries (SB2s) using Vsin i values from spectral fits. The method is tested on synthetic and real spectra from the Large Sky Area Multi-Object fiber Spectroscopic Telescope Medium Resolution Survey. It can reliably detect SB2 candidates for double-lined binaries with $V \sin …
Transient acceleration events in LISA Pathfinder data: Properties and possible physical origin
Mendes, L.; Russano, G.; Nofrarias, M. +79 more
We present an in depth analysis of the transient events, or glitches, detected at a rate of about one per day in the differential acceleration data of LISA Pathfinder. We show that these glitches fall in two rather distinct categories: fast transients in the interferometric motion readout on one side, and true force transient events on the other. …
A solar coronal loop in a box: Energy generation and heating
Peter, H.; Chitta, L. P.; Solanki, S. K. +4 more
Context. Coronal loops are the basic building block of the upper solar atmosphere as seen in the extreme UV and X-rays. Comprehending how these are energized, structured, and evolve is key to understanding stellar coronae.
Aims: Here we investigate how the energy to heat the loop is generated by photospheric magneto-convection, transported in…
Wide Twin Binaries are Extremely Eccentric: Evidence of Twin Binary Formation in Circumbinary Disks
Ting, Yuan-Sen; Rix, Hans-Walter; Zakamska, Nadia L. +3 more
The Gaia mission recently revealed an excess population of equal-mass "twin" wide binaries, with mass ratio q ≳ 0.95, extending to separations of at least 1000 au. The origin of this population is an enigma: Twin binaries are thought to form via correlated accretion in circumbinary disks, but the typical observed protostellar disks have radii of ~…
An INTEGRAL/SPI view of reticulum II: particle dark matter and primordial black holes limits in the MeV range
Calore, Francesca; Vincent, Aaron C.; Diehl, Roland +4 more
Reticulum II (Ret II) is a satellite galaxy of the Milky Way (MW) and presents a prime target to investigate the nature of dark matter (DM) because of its high mass-to-light ratio. We evaluate a dedicated INTEGRAL observation campaign data set to obtain γ-ray fluxes from Ret II and compare those with expectations from DM. Ret II is not detected in…
Contribution of Gaia Sausage to the Galactic Stellar Halo Revealed by K Giants and Blue Horizontal Branch Stars from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope, Sloan Digital Sky Survey, and Gaia
Bird, Sarah A.; Zhao, Gang; Yang, Chengqun +2 more
We explore the contribution of the Gaia Sausage to the stellar halo of the Milky Way by making use of a Gaussian mixture model (GMM) and applying it to halo star samples of Large Sky Area Multi-Object Fiber Spectroscopic Telescope K giants, Sloan Extension for Galactic Understanding and Exploration K giants, and Sloan Digital Sky Survey blue horiz…