Zobrazeno 1 - 10
of 55
pro vyhledávání: '"Keiser, Sandra A."'
Autor:
Boss, Alan P., Weinberger, Alycia J., Keiser, Sandra A., Astraatmadja, Tri L., Anglada-Escude, Guillem, Thompson, Ian B.
Transit photometry of the M8V dwarf star TRAPPIST-1 (2MASS J23062928-0502285) has revealed the presence of at least seven planets with masses and radii similar to that of Earth orbiting at distances that might allow liquid water to be present on thei
Externí odkaz:
http://arxiv.org/abs/1708.02200
Autor:
Donaldson, Jessica K., Weinberger, Alycia J., Gagné, Jonathan, Faherty, Jacqueline K., Boss, Alan P., Keiser, Sandra A.
The TW Hya Association (TWA) is a nearby stellar association with an age of $\sim$ 5-10 Myr. This is an important age for studying the late stages of star and planet formation. We measure the parallaxes of 14 candidate members of TWA. That brings to
Externí odkaz:
http://arxiv.org/abs/1610.01667
Autor:
Boss, Alan P., Keiser, Sandra A.
Both astronomical observations of the interaction of Type II supernova remnants (SNR) with dense interstellar clouds as well as cosmochemical studies of the abundances of daughter products of short-lived radioisotopes (SLRIs) formed by supernova nucl
Externí odkaz:
http://arxiv.org/abs/1507.03956
Autor:
Boss, Alan P., Keiser, Sandra A.
A key test of the supernova triggering and injection hypothesis for the origin of the solar system's short-lived radioisotopes is to reproduce the inferred initial abundances of these isotopes. We present here the most detailed models to date of the
Externí odkaz:
http://arxiv.org/abs/1404.7190
Autor:
Boss, Alan P., Keiser, Sandra A.
A variety of stellar sources have been proposed for the origin of the short-lived radioisotopes that existed at the time of the formation of the earliest Solar System solids, including Type II supernovae, AGB and super-AGB stars, and Wolf-Rayet star
Externí odkaz:
http://arxiv.org/abs/1305.0249
Autor:
Boss, Alan P., Keiser, Sandra A.
Magnetic fields are important contributers to the dynamics of collapsing molecular cloud cores, and can have a major effect on whether collapse results in a single protostar or fragmentation into a binary or multiple protostar system. New models are
Externí odkaz:
http://arxiv.org/abs/1301.4495
Autor:
Boss, Alan P., Keiser, Sandra A.
A supernova is a likely source of short-lived radioisotopes (SLRIs) that were present during the formation of the earliest solar system solids. A suitably thin and dense supernova shock wave may be capable of triggering the self-gravitational collaps
Externí odkaz:
http://arxiv.org/abs/1207.4993
Autor:
Boss, Alan P., Keiser, Sandra A.
The short-lived radioisotope $^{60}$Fe requires production in a core collapse supernova or AGB star immediately before its incorporation into the earliest solar system solids. Shock waves from a somewhat distant supernova, or a relatively nearby AGB
Externí odkaz:
http://arxiv.org/abs/1005.3981
Autor:
Boss, Alan P., Keiser, Sandra A., Ipatov, Sergei I., Myhill, Elizabeth A., Vanhala, Harri A. T.
Publikováno v:
Astrophys.J.708:1268-1280,2010
The discovery of decay products of a short-lived radioisotope (SLRI) in the Allende meteorite led to the hypothesis that a supernova shock wave transported freshly synthesized SLRI to the presolar dense cloud core, triggered its self-gravitational co
Externí odkaz:
http://arxiv.org/abs/0911.3417
Autor:
Boss, Alan P., Ipatov, Sergei I., Keiser, Sandra A., Myhill, Elizabeth A., Vanhala, Harri A. T.
Cosmochemical evidence for the existence of short-lived radioisotopes (SLRI) such as $^{26}$Al and $^{60}$Fe at the time of the formation of primitive meteorites requires that these isotopes were synthesized in a massive star and then incorporated in
Externí odkaz:
http://arxiv.org/abs/0809.3045