Search Publications
A review of planetary systems around HD 99492, HD 147379, and HD 190007 with HARPS-N
Poretti, E.; Sozzetti, A.; Delisle, J. -B. +26 more
Context. The Rocky Planet Search (RPS) program is dedicated to a blind radial velocity (RV) search of planets around bright stars in the northern hemisphere, using the high-resolution echelle spectrograph HARPS-N installed on the Telescopio Nazionale Galileo (TNG).
Aims: The goal of this work is to revise and update the properties of three pl…
ALMA Lensing Cluster Survey: Properties of Millimeter Galaxies Hosting X-Ray-detected Active Galactic Nuclei
Fujimoto, Seiji; Kohno, Kotaro; Sun, Fengwu +10 more
We report the multiwavelength properties of millimeter galaxies hosting X-ray detected active galactic nuclei (AGNs) from the ALMA Lensing Cluster Survey (ALCS). ALCS is an extensive survey of well-studied lensing clusters with ALMA, covering an area of 133 arcmin2 over 33 clusters with a 1.2 mm flux-density limit of ~60 µJy (1σ).…
High-resolution spectroscopic analysis of four new chemically peculiar stars
Pereira, C. B.; Sneden, C.; Drake, N. A. +3 more
We present detailed chemical compositions of four stars on the first-ascent red giant branch that are classified as chemically peculiar, but lack comprehensive analyses at high spectral resolution. For BD+03°2688, HE 0457-1805, HE 1255-2324, and HE 2207-1746, we derived metallicities [Fe/H] = -1.21, -0.19, -0.31, and -0.55, respectively, indicatin…
The Outer spiral arm of the Milky Way using red clump stars. Tracing the asymmetry across the disc
Ganesh, Shashikiran; Schultheis, Mathias; Uppal, Namita
Aims: Our aim is to provide an observational view of the old disc structure of the Milky Way galaxy using the distribution of red clump (RC) stars. The spiral arms, warp structure, and other asymmetries present in the disc are revisited using a systematic study of RC star counts over the disc of the Galaxy.
Methods: We developed a method…
Probing the Galactic halo with RR Lyrae stars - IV. On the Oosterhoff dichotomy of RR Lyrae stars
Tian, Haijun; Liu, Gaochao; Huang, Yang +8 more
We use 3653 (2661 RRab, 992 RRc) RR Lyrae stars (RRLs) with 7D (3D position, 3D velocity, and metallicity) information selected from Sloan Digital Sky Survey, Large Sky Area Multi-Object Fiber Spectroscopic Telescope, and Gaia EDR3, and divide the sample into two Oosterhoff groups (Oo I and Oo II) according to their amplitude-period behaviour in t…
Gaia view of primitive inner-belt asteroid families. Searching for the origins of asteroids Bennu and Ryugu
Delbo, M.; Avdellidou, C.; Walsh, K. J.
Aims: The near-Earth asteroids Ryugu and Bennu were visited, characterised, and sampled by the Hayabusa2 and OSIRIS-REx missions, where remote sensing data and sample return analysis showed that both asteroids have primitive, hydrated, and organic-rich compositions. The dark families of the inner main belt that belong to the spectroscopic C-c…
NuSTAR Observations of a Heavily X-Ray-obscured AGN in the Dwarf Galaxy J144013+024744
Trump, Jonathan R.; Brandt, W. N.; Swartz, Douglas A. +10 more
We present a multiwavelength analysis of the dwarf Seyfert 2 galaxy J144013+024744, a candidate obscured active galactic nucleus (AGN) thought to be powered by an intermediate-mass black hole (IMBH, M • ≈ 104-106 M ⊙) of mass M • ~ 105.2 M ⊙. To study its X-ray properties…
Modulation of Cosmic-Ray Antiprotons in the Heliosphere: Simulations for a Solar Cycle
Luo, Xi; Potgieter, M. S.; Aslam, O. P. M. +1 more
The precision measurements of galactic cosmic-ray protons from the Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics and the Alpha Magnetic Spectrometer are reproduced using a well-established three-dimensional numerical model for the period 2006 July-2019 November. The resulting modulation parameters are applied to simulate …
Assessing the spectral characteristics of band splitting type II radio bursts observed by CALLISTO spectrometers
Kozarev, Kamen; Minta, Felix N.; Nozawa, Satoshi I. +2 more
Metric type II radio bursts are usually early indicators of CME-driven shocks and other space weather phenomena in the solar corona. This paper presents a detailed investigation of the spectral properties of band splitting type II radio bursts and their association with sunspot number. Using type II radio bursts in a frequency range [20 MHz-200 MH…
Understanding the Duration of Solar and Stellar Flares at Various Wavelengths
Reep, Jeffrey W.; Airapetian, Vladimir S.
Recent irradiance measurements from numerous heliophysics and astrophysics missions including Solar Dynamics Observatory (SDO), GOES, Kepler, TESS, Chandra, the X-ray Multi-Mirror Mission, and NICER have provided critical input into understanding the physics of the most powerful transient events on the Sun and magnetically active stars:solar and s…