Results 41 to 50 of about 241,534 (269)

A planetary companion around the K giant eps Corona Borealis

, 2012
Aims. Our aim is to search for and study the origin of the low-amplitude and long-periodic radial velocity (RV) variations in K giants. Methods. We present high-resolution RV measurements of K2 giant epsilon CrB from February 2005 to January 2012 using ...
B.-C. Lee, Bertelli, D. E. Mkrtichian, da Silva, de Medeiros, Donati, Döllinger, Döllinger, Fischer, Frink, Gettel, Ghezzi, Girardi, Glazunova, Han, Han, Hatzes, Hatzes, Hatzes, Hekker, I. Han, Ida, Johnson, Johnson, Johnson, Johnson, Jørgensen, K.-M. Kim, Kim, Kürster, Lee, Lomb, Lovis, M.-G. Park, Massarotti, Mitchell, Moutou, Niedzielski, Pasquini, Pasquini, Piskunov, Quirrenbach, Reffert, Reiners, Richichi, Saar, Santos, Sato, Sato, Sato, Scargle, Setiawan, Setiawan, Shaya, Sozzetti, Takeda, Tody, Wittenmyer   +57 more
core   +1 more source

Elucidating the Role of Surface Ligands on the Oxidative Etching of Au Bipyramids During Photothermia Using Liquid Cell Transmission Electron Microscopy

Advanced Functional Materials, EarlyView.
Gold bipyramids can act as efficient plasmonic nanoheaters, but they often reshape during laser heating. This study shows that oxygen nanobubbles drive oxidative etching and that surface ligands control stability. CTAB‐ and citrate‐coated particles blunt and lose optical performance, whereas polystyrene sulfonate preserves shape and heating by ...
Irene López‐Sicilia, Valentina Girelli Consolaro, Sophie Marbach, Nancy Rahbany, Grégoire Petit, Ovidiu Ersen, Juan J. Giner‐Casares, Ali Abou‐Hassan   +7 more
wiley   +1 more source

Narrow-Band Spectrophotometry of Comet Hale-Bopp (C/1995 O1) Near Perihelion I.: Photometric Behavior of C2, C3, CN Molecular Bands [PDF]

Journal of Astronomy and Space Sciences, 2000
We present the results from narrow-band spectrophotometry of Comet Hale-Bopp (C/1995 O1) near perihelion obtained at Sobaeksan Optical Astronomy Observatory 61cm telescope equipped with PM 512 CCD camera (512 x 512, 0.5''/pixel) and narrow-band filter ...
Eon-Chang Sung, Ho-Il Kim, Jae Hyuk Youn
doaj  

Variational views for self-supervised learning in radio astronomy

Modern astronomical surveys are producing progressively larger and more complex datasets, making traditional supervised approaches that rely on extensive labelled catalogues increasingly difficult. Consequently, pre-training using self-supervised learning (SSL), which offers a scalable route by extracting structure directly from unlabelled images, is ...
Alphonse, Johnny Joseph, Scaife, Anna M. M.   +1 more
openaire   +2 more sources

Visible-IR Colors and Lightcurve Analysis of Two Bright TNOs: 1999 TC36 and 1998 SN165

, 2002
We report on observations of two bright Trans-Neptunian Objects (TNOs) - 1999 TC36 and 1998 SN165}- during two observational campaigns, as part of the Meudon Multicolor Survey of Outer Solar System Objects. V-J color was measured for 1999 TC36 (V-J=2.34+/
Doressoundiram, A., Peixinho, N., Romon-Martin, J.   +2 more
core   +3 more sources

Probing the variability of the fine-structure constant with the VLT/UVES [PDF]

, 2003
We assess the cosmological variability of the fine-structure constant from the analysis of an ensemble of Fe II absorption lines at the redshift z=1.15 toward the QSO HE 0515-4414 by means of the standard many-multiplet (MM) technique and its revision ...
Levshakov, Sergei A., Quast, Ralf, Reimers, Dieter   +2 more
core   +1 more source

Chirality and Organization of Adsorbates Modify Surface Phonon Dynamics

Advanced Functional Materials, EarlyView.
Chirality and molecular organization are shown to influence surface phonon dynamics in gold films. Time‐resolved Joule heating measurements reveal that ordered homochiral monolayers increase the Debye temperature and disordered layers reduce it, while ordered racemic controls have no effect.
Meital Ozeri, Eugenia Pyurbeeva, Shira Yochelis, Jonas Fransson, Ronnie Kosloff, Oded Millo, Yossi Paltiel   +6 more
wiley   +1 more source

TOI-4495: A Pair of Aligned, Near-resonant Sub-Neptunes That Likely Experienced Overstable Migration

The Astronomical Journal
We report the discovery of a sub-Neptune and a Neptune-like planet ( R ${}_{b}=2.4{8}_{-0.10}^{+0.14}$ R _⊕ , R ${}_{c}=4.0{3}_{-0.15}^{+0.23}$ R _⊕ ) orbiting the F-type star TOI-4495.
Mu-Tian Wang, Fei Dai, Hui-Gen Liu, Kento Masuda, Andrew W. Howard, Samuel Halverson, Howard Isaacson, Elina Y. Zhang, Max Goldberg, Huan-Yu Teng, Ryan A. Rubenzahl, Benjamin Fulton, Erik A. Petigura, Steven Giacalone, Luke Handley, David W. Latham, Allyson Bieryla, Ashley Baker, Jerry Edelstein, Steven R. Gibson, Kodi Rider, Arpita Roy, Chris Smith, Josh Walawender, David Rapetti, Jon M. Jenkins, Joshua N. Winn   +26 more
doaj   +1 more source

Heliocentric Potential (HCP) Prediction Model for Nowscast of Aviation Radiation Dose [PDF]

Journal of Astronomy and Space Sciences, 2015
It is well known that the space radiation dose over the polar route should be carefully considered especially when the space weather shows sudden disturbances such as CME and flares.
Junga Hwang, Kyung-Chan Kim, Kyunghwan Dokgo, Enjin Choi, Hang-Pyo Kim   +4 more
doaj   +1 more source

Suzaku observation of the Phoenix Galaxy [PDF]

, 2009
In recent years, several Seyfert 2 galaxies have been discovered that change state when observed in X-rays a few years apart, switching from Compton-thin to reflection-dominated or viceversa. We observed a member of this class of "Changing-look" sources,
A. Comastri, Anders, Anders, Awaki, Baluinska-Church, Bianchi, E. Jimenez-Bailon, F. Nicastro, G. Matt, Ghisellini, Gilli, Guainazzi, Guainazzi, Guainazzi, Guainazzi, Guainazzi, H. Awaki, K. Iwasawa, Koyama, Lamastra, M. Guainazzi, Matt, Matt, Matt, Matt, Molendi, Piconcelli, S. Bianchi, Sunyaev, Watanabe   +29 more
core   +1 more source