Search Publications
Analyzing JWST/NIRSpec Hydrogen Line Detections at TWA 27B: Constraining Accretion Properties and Geometry
Hashimoto, Jun; Marleau, Gabriel-Dominique; Aoyama, Yuhiko
Hydrogen lines from forming planets are crucial for understanding planet formation. However, the number of planetary hydrogen line detections is still limited. Recent JWST/NIRSpec observations have detected Paschen and Brackett hydrogen lines at TWA 27 B (2M1207b). Although classified as a planetary- mass companison (PMC) rather than a planet due …
Quantifying the diffusion of suprathermal electrons by whistler waves between 0.2 and 1 AU with Solar Orbiter and Parker Solar Probe
Maksimovic, M.; Kretzschmar, M.; Berthomier, M. +7 more
Context. The evolution of the solar wind electron distribution function with heliocentric distance exhibits different features that are still unexplained, in particular, the fast decrease in the electron heat flux and the increase in the Strahl pitch angle width. Wave-particle interactions between electrons and whistler waves are often proposed to…
Symbiotic stars in X-rays: IV. XMM-Newton, Swift, and TESS observations
Nuñez, N. E.; Mukai, K.; Sokoloski, J. L. +7 more
White dwarf symbiotic binaries are detected in X-rays with luminosities in the range of 1030–1034 ergs s‑1. Their X-ray emission arises either from the accretion disk boundary layer, from a region where the winds from both components collide, or from nuclear burning on the surface of the white dwarf (WD). In our co…
An Empirical Extinction Curve Revealed by Gaia XP Spectra and LAMOST
Zhang, Xiangyu; Wang, Tao; Huang, Bowen +4 more
We present a direct measurement of extinction curves using corrected Gaia XP spectra of the common sources in Gaia DR3 and LAMOST DR7. Our analysis of approximately 370,000 high-quality samples yielded a high-precision average extinction curve for the Milky Way. After incorporating infrared photometric data from Two Micron All Sky Survey and Wide-…
The TESS-Keck Survey. VII. A Superdense Sub-Neptune Orbiting TOI-1824
Batalha, Natalie M.; Mayo, Andrew W.; Rice, Malena +35 more
We confirm a massive sub-Neptune-sized planet on a P = 22.8 days orbit around the star TOI-1824 (T eff = 5200 K, V = 9.7 mag). TESS first identified TOI-1824 b (formerly TOI-1824.01) as an object of interest in 2020 April after two transits in Sector 22 were matched with a single transit in Sector 21. TOI-1824 was subsequently targeted …
AWSoM Magnetohydrodynamic Simulation of a Solar Active Region. II. Statistical Analysis of Alfvén Wave Dissipation and Reflection, Scaling Laws, and Energy Budget on Coronal Loops
Landi, Enrico; van der Holst, Bart; Manchester, Ward +6 more
The coronal heating problem has been a major challenge in solar physics, and a tremendous amount of effort has been made over the past several decades to solve it. In this paper, we aim at answering how the physical processes behind the Alfvén wave turbulent heating adopted in the Alfvén Wave Solar atmosphere Model (AWSoM) unfold in individual pla…
GAUSSN: Bayesian time-delay estimation for strongly lensed supernovae
Arendse, Nikki; Grayling, Matthew; Dhawan, Suhail +3 more
We present GAUSSN, a Bayesian semiparametric Gaussian Process (GP) model for time-delay estimation with resolved systems of gravitationally lensed supernovae (glSNe). GAUSSN models the underlying light curve non-parametrically using a GP. Without assuming a template light curve for each SN type, GAUSSN fits for the time delays of all images using …
Detailed study of a rare hyperluminous rotating disk in an Einstein ring 10 billion years ago
Cresci, Giovanni; Frye, Brenda L.; Yun, Min S. +83 more
Hyperluminous infrared galaxies (HyLIRGs) are the rarest and most extreme starbursts and found only in the distant Universe (z ≳ 1). They have intrinsic infrared (IR) luminosities LIR ≥ 1013 L⊙ and are commonly found to be major mergers. Recently, the Planck All-Sky Survey to Analyze Gravitationally-lensed Extreme …
New Results on the Onset of a Coronal Mass Ejection from 5303 Å Emission Line Observations with VELC/ADITYA-L1
Ramesh, R.; Singh, Jagdev; Sasikumar Raja, K. +3 more
We report on the onset of a coronal mass ejection (CME) using spectroscopic observations in the 5303 Å coronal emission line with the Visible Emission Line Coronagraph (VELC) onboard ADITYA-L1, the recently launched first Indian space solar mission. The CME was observed on 2024 July 16 in association with an X1.9 class soft X-ray flare from heliog…
BEBOP V. Homogeneous stellar analysis of potential circumbinary planet hosts
Hellier, Coel; Triaud, Amaury H. M. J.; Sairam, Lalitha +29 more
Planets orbiting binary systems are relatively unexplored compared to those around single stars. Detections of circumbinary planets and planetary systems offer a first detailed view into our understanding of circumbinary planet formation and dynamical evolution. The BEBOP (binaries escorted by orbiting planets) radial velocity survey plays a speci…