Results 61 to 70 of about 4,179 (318)

X-ray emission from optical novae in M 31

, 2009
The first supersoft source (SSS) identification with an optical nova in M 31 was based on ROSAT observations. Twenty additional X-ray counterparts (mostly identified as SSS by their hardness ratios) were detected using archival ROSAT, XMM-Newton and ...
Darnley, Della Valle, Della Valle, Di Stefano, Drake, Greiner, Haberl, Haberl, Hachisu, Hachisu, Henze, Henze, Henze, José, Kaaret, Kong, Lee, MacDonald, Nedialkov, Ness, Orio, Osborne, Osborne, Pietsch, Pietsch, Pietsch, Pietsch, Riffeser, Sala, Sala, Shafter, Shafter, Shafter, Smirnova, Smirnova, Supper, Supper, Trudolyubov, Tuchman, Voss, Yaron, Ögelman   +41 more
core   +1 more source

The Progenitors of Type Ia Supernovae: II. Are they Double-Degenerate Binaries? The Symbiotic Channel [PDF]

, 2010
In order for a white dwarf (WD) to achieve the Chandrasekhar mass, M_C, and explode as a Type Ia supernova (SNIa), it must interact with another star, either accreting matter from or merging with it.
Brown, Cappellaro, Cassisi, Catalán, Di Stefano, Di Stefano, Di Stefano, Di Stefano, Di Stefano, Di Stefano, Di Stefano, Di Stefano, Dilday, Fabbiano, Genzel, Ghez, Ghez, Graham, Kalirai, Kato, Kenyon, Kotak, Kuznetsova, Liu, Magrini, Nelson, Nomoto, Nomoto, Orio, Panagia, Pence, Piersanti, R. Di Stefano, Riess, Salim, Sarazin, Shen, Swartz, Weidemann, Williams   +39 more
core   +1 more source

Three‐Dimensional Hierarchical Nanowire‐Networks with Deep‐Focus Tolerance and Adhesion Robustness for Harsh‐Environment SERS Sensing

Advanced Functional Materials, EarlyView.
A 3D nanowire‐network SERS substrate with robust adhesion is developed, featuring pronounced z‐direction optical activity, ultralow detection limit (1.5 × 10−13 M), and excellent signal uniformity (RSD < 10%). Enabled by enhanced light scattering, increased optical density of states, and structural reinforcement, the substrate demonstrates stable, high‐
Jinglai Duan, Wentao Wang, Xiu Liang, Yongliang Zhang, Jie Liu, Yu Bai, Dangyuan Lei   +6 more
wiley   +1 more source

Exploring the Maximum Magnitude versus Rate of Decline Relation for Novae in M31

The Astrophysical Journal Supplement Series
The results of a two-decade-long R -band photometric survey of novae in M31 are presented. From these data, R -band light curves have been determined for 180 novae with data sufficient for estimating the peak brightness and subsequent rate of decline ...
J. Grace Clark, Kamil Hornoch, Allen W. Shafter, Hana Kučáková, Jan Vraštil, Peter Kušnirák, Marek Wolf   +6 more
doaj   +1 more source

Early X-ray emission from Type Ia supernovae originating from symbiotic progenitors or recurrent novae [PDF]

, 2014
One of the key observables for determining the progenitor nature of Type Ia supernovae is provided by their immediate circumstellar medium, which according to several models should be shaped by the progenitor binary system.
Chiotellis, Alexandros, Dimitriadis, Georgios, Vink, Jacco   +2 more
core   +3 more sources

Pixelation‐Free, Monolithic Iontronic Pressure Sensors Enabling Large‐Area Simultaneous Pressure and Position Recognition via Machine Learning

Advanced Functional Materials, EarlyView.
A pixelation‐free, monolithic iontronic pressure sensor enables simultaneous pressure and position sensing over large areas. AC‐driven ion release generates spatially varying impedance pathways depending on the pressure. Machine learning algorithms effectively decouple overlapping pressure–position signals from the multichannel outputs, achieving high ...
Juhui Kim, Junseo Lee, Kwang‐Hun Choi, Seongil Im, Jae Hong Kim, Changsoon Choi, Junghwan Byun, Changhwan Shin, Ho Won Jang, Hyunsu Ju, Jung Ah Lim   +10 more
wiley   +1 more source

Recurrent Nova V2487 Oph Had Superflares in 1941 and 1942 with Radiant Energies of 1042.5±1.6 erg

The Astrophysical Journal
V2487 Ophiuchi (V2487 Oph) is a recurrent nova with classical nova eruptions in 1900 and 1998, and it is also the most extreme known superflare star. These superflares are roughly hour-long flares with amplitudes and optical energies reaching up to 1.10 ...
Bradley E. Schaefer
doaj   +1 more source

On the observability of recurrent nova super-remnants

Monthly Notices of the Royal Astronomical Society, 2023
ABSTRACTThe nova super-remnant (NSR) surrounding M 31N 2008-12a (12a), the annually erupting recurrent nova (RN), is the only known example of this phenomenon. As this structure has grown as a result of frequent eruptions from 12a, we might expect to see NSRs around other RNe; this would confirm the RN–NSR association and strengthen the connection ...
M W Healy-Kalesh, M J Darnley, É J Harvey, C M Copperwheat, P A James, T Andersson, M Henze, T J O’Brien   +7 more
openaire   +3 more sources

Porous Coatings by Vapor Sublimation and Deposition for Molecular Channeling and Filtration in an Interstitial Fluid Microfiltration Device

Advanced Healthcare Materials, EarlyView.
A vapor‐based porous coating applied within nitinol tubes demonstrated complete suppression of cellular and tissue ingrowth, overcoming a major limitation of implantable interstitial fluid collection devices. Molecular channeling and diffusion are analyzed with probe molecules, showing reliable transport in vitro and in vivo. The coating also achieved >
Yu‐Ming Chang, Chi‐Yu Huang, Yi‐Jia Ke, Yi‐Wei Lin, Yen‐Hui Chan, Ying‐Chang Lu, Yu‐Chih Chiang, Chen‐Chi Wu, Hsien‐Yeh Chen   +8 more
wiley   +1 more source

Orbital Period Changes of Recurrent Nova U Scorpii Demonstrate That Mejecta = 26 × Maccreted, So U Sco Is Not a Type Ia Supernova Progenitor

The Astrophysical Journal
Recurrent nova U Scorpii (U Sco) is one of the prototypes for a Type Ia supernova progenitor. The logic is that the white dwarf is near the Chandrasekhar mass and gas is accumulating onto its surface at a near-maximal accretion rate, so it will soon ...
Bradley E. Schaefer, Gordon Myers
doaj   +1 more source