Search Publications
The Nuclear Star Cluster and Nuclear Stellar Disk of the Milky Way: Different Stellar Populations and Star Formation Histories
Neumayer, Nadine; Schödel, Rainer; Nogueras-Lara, Francisco
The Milky Way's nuclear stellar disk (NSD) and nuclear star cluster (NSC) are the main features of the Galactic center. Nevertheless, their observation is hampered by the extreme source crowding and high extinction. Hence, their relation and formation scenario are not fully clear yet. We aim to detect the stellar populations from the NSC and the N…
Disk Masses and Dust Evolution of Protoplanetary Disks around Brown Dwarfs
Espaillat, Catherine C.; Rilinger, Anneliese M.
We present the largest sample of brown dwarf (BD) protoplanetary disk spectral energy distributions modeled to date. We compile 49 objects with ALMA observations from four star-forming regions: ρ Ophiuchus, Taurus, Lupus, and Upper Scorpius. Studying multiple regions with various ages enables us to probe disk evolution over time. Specifically, fro…
The First Retrieval of a Substellar Subdwarf: A Cloud-free SDSS J125637.13-022452.4
Gonzales, Eileen C.; Marley, Mark; Faherty, Jacqueline K. +5 more
We present the first retrieval analysis of a substellar subdwarf, SDSS J125637.13-022452.4 (SDSS J1256-0224), using the Brewster retrieval code base. We find SDSS J1256-0224 is best fit by a cloud-free model with an ion (neutral H, H-, and electron) abundance corresponding to ${\left[\mathrm{Fe}/{\rm{H}}\right]}_{\mathrm{ion}}=-1.5$ . H…
Comparative Analysis of the 2020 November 29 Solar Energetic Particle Event Observed by Parker Solar Probe
Lario, D.; Palmerio, E.; Mitchell, D. G. +15 more
We analyze two specific features of the intense solar energetic particle (SEP) event observed by Parker Solar Probe (PSP) between 2020 November 29 and 2020 December 2. The interplanetary counterpart of the coronal mass ejection (CME) on 2020 November 29 that generated the SEP event (hereafter ICME-2) arrived at PSP (located at 0.8 au from the Sun)…
Earth Wind as a Possible Exogenous Source of Lunar Surface Hydration
Wei, Y.; Zhang, H.; Xia, L. D. +22 more
Understanding the sources of lunar water is crucial for studying the history of lunar evolution, as well as the interaction of solar wind with the Moon and other airless bodies. Recent orbital spectral observations revealed that the solar wind is a significant exogenous driver of lunar surficial hydration. However, the solar wind is shielded over …
Ultramassive Black Holes in the Most Massive Galaxies: MBH-σ versus MBH-Rb
Gil de Paz, Armando; Knapen, Johan H.; Dullo, Bililign T.
We investigate the nature of the relations between black hole (BH) mass (MBH) and the central velocity dispersion (σ) and, for core-Sérsic galaxies, the size of the depleted core (Rb). Our sample of 144 galaxies with dynamically determined MBH encompasses 24 core-Sérsic galaxies, thought to be products of gas-poor …
Classical Novae Masquerading as Dwarf Novae? Outburst Properties of Cataclysmic Variables with ASAS-SN
Mukai, K.; Kochanek, C. S.; Stanek, K. Z. +12 more
The unprecedented sky coverage and observing cadence of the All-Sky Automated Survey for SuperNovae (ASAS-SN) has resulted in the discovery and continued monitoring of a large sample of Galactic transients. The vast majority of these are accretion-powered dwarf nova outbursts in cataclysmic variable systems, but a small subset are thermonuclear-po…
Long-term Coherent Timing of the Accreting Millisecond Pulsar IGR J17062-6143
Bult, Peter; Malacaria, Christian; Ng, Mason +2 more
We report on a coherent timing analysis of the 163 Hz accreting millisecond X-ray pulsar IGR J17062-6143. Using data collected with the Neutron Star Interior Composition Explorer and XMM-Newton, we investigated the pulsar evolution over a time span of four years. We obtained a unique phase-coherent timing solution for the stellar spin, finding the…
Reproducing the UVJ Color Distribution of Star-forming Galaxies at 0.5 < z < 2.5 with a Geometric Model of Dust Attenuation
Belli, Sirio; Tacchella, Sandro; Leja, Joel +1 more
We analyze the distribution of rest-frame U - V and V - J colors for star-forming galaxies at 0.5 < z < 2.5. Using stellar population synthesis, stochastic star formation histories, and a simple prescription for the dust attenuation that accounts for the shape and inclination of galaxies, we construct a model for the distribution of galaxy c…
The Wolf-Rayet + Black Hole Binary NGC 300 X-1: What is the Mass of the Black Hole?
Williams, Benjamin F.; Eracleous, Michael; Plucinsky, Paul P. +6 more
We present new X-ray and UV observations of the Wolf-Rayet + black hole (BH) binary system NGC 300 X-1 with the Chandra X-ray Observatory and the Hubble Space Telescope Cosmic Origins Spectrograph. When combined with archival X-ray observations, our X-ray and UV observations sample the entire binary orbit, providing clues to the system geometry an…