Search Publications
Utilizing Photometry from Multiple Sources to Mitigate Stellar Variability in Precise Radial Velocities: A Case Study of Kepler-21
Wright, Jason T.; Logsdon, Sarah E.; Luque, Rafael +26 more
We present a new analysis of Kepler-21, the brightest (V = 8.5) Kepler system with a known transiting exoplanet, Kepler-21 b. Kepler-21 b is a radius valley planet (R = 1.6 ± 0.2R ⊕) with an Earth-like composition (8.38 ± 1.62 g cm–3), though its mass and radius fall in the regime of possible "water worlds." We utilize new Ke…
Absorption Troughs of Lyα Emitters in HETDEX
Schneider, Donald P.; Chisholm, John; Kollatschny, Wolfram +21 more
The Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) is designed to detect and measure the redshifts of more than 1 million Lyα emitting galaxies (LAEs) 1.88 < z < 3.52. In addition to its cosmological measurements, these data enable studies of Lyα spectral profiles and the underlying radiative transfer. Using the roughly half a millio…
Variability in Protoplanetary Nebulae. X. Multiyear Periods as an Indicator of Potential Binaries
Lu, Wenxian; Hrivnak, Bruce J.; Henson, Gary +1 more
New observations are presented of four evolved objects that display long, multiyear variations in their light curves. These are interpreted as good evidence of their binary nature, with the modulation caused by the barycenter motion of the evolved star resulting in a periodic obscuration by a circumbinary disk. Although protoplanetary nebulae (PPN…
Chemo-dynamics of the stellar component of the Sculptor dwarf galaxy: I. Observed properties
Tolstoy, Eline; Thomas, Guillaume F.; Battaglia, Giuseppina +3 more
Aims. Recently, both the presence of multiple stellar chemo-kinematic components and rotation in the Sculptor dwarf spheroidal galaxy have been put into question. Therefore, we re-examine the chemo-kinematic properties of this galaxy, making use of the best spectroscopic dataset available containing both the line-of-sight velocities and metallicit…
Unveiling the shape: A multi-wavelength analysis of the galaxy clusters Abell 76 and Abell 1307
Böhringer, H.; Chon, G.; Barrena, R. +1 more
We analyse the dynamical state of the galaxy clusters Abell 76 and Abell 1307 from the optical point of view, presenting a coherent scenario that responds to the X-ray emissions observed in these structures. Our study is based on 231 and 164 spectroscopic redshifts, for the clusters A76 and A1307, respectively, obtained mostly with the Telescopio …
Very Large and Long-lasting Anisotropies Caused by Sunward Streaming Energetic Ions: Solar Orbiter and STEREO A Observations
Luhmann, J. G.; Palmerio, E.; Jebaraj, I. C. +14 more
The anisotropy of energetic particles provides essential information to help resolve the underlying fundamental physics of their spatial distributions, injection, acceleration, and transport processes. In this work, we report an energetic ion enhancement that is characterized by very large and long-lasting anisotropies observed by STEREO A and Sol…
The wave-like disc oscillations of mono-age stellar populations in the Solar neighbourhood from Gaia DR3
Chen, Bing-Qiu; Wang, Tao; Liu, Xiao-Wei +2 more
The North-South asymmetry in the number density and bulk velocity of stars in the Solar neighbourhood provides valuable insights into the formation and evolution of the Milky Way disc. Our objective is to investigate the wave-like disc oscillations of mono-age stellar populations in the Solar neighbourhood using data from Gaia Data Release 3. We h…
The black widow pulsar J1641+8049 in the optical, radio, and X-rays
Geier, S.; Zharikov, S. V.; Karpova, A. V. +14 more
PSR J1641+8049 is a 2 ms black widow pulsar with the 2.2 h orbital period detected in the radio and γ-rays. We performed new phase-resolved multiband photometry of PSR J1641+8049 using the OSIRIS instrument at the Gran Telescopio Canarias. The obtained data were analysed together with the new radio-timing observations from the Canadian Hydrogen In…
High-resolution X-ray spectra of the compact binary supersoft X-ray source CAL 87
Pei, Songpeng; Li, Qiang; Zhang, Xiaowan +1 more
In this study we present an analysis of the archival X-ray data of the eclipsing supersoft X-ray binary CAL 87 observed with the Chandra Advanced CCD Imaging Spectrometer (ACIS) camera and Low Energy Transmission Grating (LETG) in 2001 August and with XMM-Newton in 2003 April. The high-resolution X-ray spectra are almost unchanged on the two diffe…
Exploring the faintest end of mid-infrared luminosity functions up to z ≃ 5 with the JWST CEERS survey
Kilerci, Ece; Hashimoto, Tetsuya; Goto, Tomotsugu +6 more
Mid-infrared (MIR) light from galaxies is sensitive to dust-obscured star formation activities because it traces the characteristic emission of dust heated by young, massive stars. By constructing the MIR luminosity functions (LFs), we are able to quantify the overall dusty star formation history and the evolution of galaxies over cosmic time. In …