Results 11 to 20 of about 16,638 (219)
Correlating Changes in Spot Filling Factors with Stellar Rotation: The Case of LkCa 4
The Astrophysical Journal, 2023 We present a multi-epoch spectroscopic study of LkCa 4, a heavily spotted non-accreting T Tauri star. Using SpeX at NASA’s Infrared Telescope Facility (IRTF), 12 spectra were collected over five consecutive nights, spanning ≈1.5 stellar rotations.
Facundo Pérez Paolino +6 more
doaj +1 more source
Exploring the Extremes: Characterizing a New Population of Old and Cold Brown Dwarfs
The Astronomical Journal, 2023 Mapping out the populations of thick disk and halo brown dwarfs is important for understanding the metallicity dependence of low-temperature atmospheres and the substellar mass function.
Aaron M. Meisner +5 more
doaj +1 more source
Second-Order Gauge-Invariant Cosmological Perturbation Theory: Current Status
Advances in Astronomy, 2010 The current status of the recent developments of the second-order gauge-invariant cosmological perturbation theory is reviewed. To show the essence of this perturbation theory, we concentrate only on the universe filled with a single scalar field ...
Kouji Nakamura
doaj +1 more source
Astronomy & AstrophysicsWe present optical and infrared observations from maximum light until around +800 days of supernova (SN) 2022jli, a peculiar stripped-envelope (SE) SN showing two maxima, each one with a peak luminosity of about 3 × 1042 erg s−1, separated by 50 days ...
Cartier Régis +8 more
doaj +1 more source
New Water Oxidation Mechanism in Photosystem II Resolves Major Experimental Controversies
Angewandte Chemie, EarlyView.In Photosystem II Oxygen Evolving Complex, we discovered the O3‐O6 peroxide at lower energy. Assignment of the O3 ligated by histidine (His337) as a slow exchanging substrate and its coupling with O6 give the O─O bond formation mechanism most consistent with all currently available experimental data. Proposal shows how protein environment can steer the
Yulia Pushkar
wiley +2 more sources
Cooperative polariton dynamics in feedback-coupled cavities
Nature Communications, 2017 Rabi oscillations of magnons typically do not have few photon control of single spin quantum systems. Here, the authors use a feedback cavity architecture to increase magnon-photon cooperativity, enabling increased control of light-matter interactions in
Bimu Yao +9 more
doaj +1 more source
The SPHEREx Target List of Ice Sources (SPLICES)
The Astrophysical Journal, 2023 One of the primary objectives of the SPHEREx mission is to understand the origin of molecules such as H _2 O, CO _2 , and other volatile compounds at the early stages of planetary system formation.
Matthew L. N. Ashby +18 more
doaj +1 more source
Angewandte Chemie, EarlyView.A new photochromic material was developed. Its on/off‐switchable absorption band is situated completely outside the human eye's visibility, in the near‐infrared (NIR) region, a feature never reported before. The photochromism mechanism in this aluminosilicate is elucidated by combining experimental as well as computational results, and the material's ...
Bettiina Muurinen +15 more
wiley +2 more sources
DECam Multimessenger Astrophysics Pipeline. I. From Raw Data to Single-exposure Candidates
The Astronomical JournalWe introduce a pipeline that performs rapid image subtraction and source selection to detect transients, with a focus on identifying gravitational-wave optical counterparts using the Dark Energy Camera (DECam). In this work, we present the pipeline steps
Shenming Fu +5 more
doaj +1 more source
EURASIP Journal on Advances in Signal Processing, 2005 This paper presents a new data compression concept, “on-board processing,†for infrared astronomy, where space observatories have limited processing resources.
Christian Reimers +4 more
doaj +1 more source