Zobrazeno 1 - 10
of 243
pro vyhledávání: '"Stephan, Alexander P."'
Many compact objects (black holes and neutron stars) exist in binaries. These binaries are normally discovered through their interactions, either from accretion as an X-ray binary or collisions as a gravitational wave source. However, the majority of
Externí odkaz:
http://arxiv.org/abs/2409.05190
The origin of Hot Jupiters (HJs) is disputed between a variety of in situ and ex situ formation scenarios. One of the early proposed ex situ scenarios was the Eccentric Kozai-Lidov (EKL) mechanism combined with tidal circularization, which can produc
Externí odkaz:
http://arxiv.org/abs/2408.13307
Autor:
Shariat, Cheyanne, Naoz, Smadar, El-Badry, Kareem, Rodriguez, Antonio C., Hansen, Bradley M. S., Angelo, Isabel, Stephan, Alexander P.
More than half of all main-sequence (MS) stars have one or more companions, and many of those with initial masses <8 M$_\odot$ are born in hierarchical triples. These systems feature two stars in a close orbit (the inner binary) while a tertiary star
Externí odkaz:
http://arxiv.org/abs/2407.06257
Autor:
Ong, J. M. Joel, Hon, Marc Teng Yen, Soares-Furtado, Melinda, Stephan, Alexander P., van Saders, Jennifer, Tayar, Jamie, Shappee, Benjamin, Hey, Daniel R., Cao, Lyra, Yıldız, Mutlu, Orhan, Zeynep Çelik, Örtel, Sibel, Montet, Benjamin, Holoien, Thomas W. -S., Bland-Hawthorn, Joss, Buder, Sven, De Silva, Gayandhi M., Freeman, Ken C., Martell, Sarah L., Lewis, Geraint F., Sharma, Sanjib, Stello, Dennis
We report the discovery and characterisation of TIC 350842552 ("Zvrk"), an apparently isolated, rapidly-rotating ($P_\text{rot} \sim 99\ \mathrm{d}$) red giant observed by TESS in its Southern Continuous Viewing Zone. The star's fast surface rotation
Externí odkaz:
http://arxiv.org/abs/2402.16971
Autor:
Capistrant, Benjamin K., Soares-Furtado, Melinda, Vanderburg, Andrew, Jankowski, Alyssa, Mann, Andrew W., Ross, Gabrielle, Srdoc, Gregor, Hinkel, Natalie R., Becker, Juliette, Magliano, Christian, Limbach, Mary Anne, Stephan, Alexander P., Nine, Andrew C., Tofflemire, Benjamin M., Kraus, Adam L., Giacalone, Steven, Winn, Joshua N., Bieryla, Allyson, Bouma, Luke G., Ciardi, David R., Collins, Karen A., Covone, Giovanni, de Beurs, Zoë L., Huang, Chelsea X., Quinn, Samuel N., Seager, Sara, Vanderspek, Roland K., Jenkins, Jon M., Kreidberg, Laura, Latham, David W., Shporer, Avi, Twicken, Joseph D., Wohler, Bill, Yarza, Ricardo, Ziegler, Carl
Young terrestrial worlds are critical test beds to constrain prevailing theories of planetary formation and evolution. We present the discovery of HD 63433d - a nearby (22pc), Earth-sized planet transiting a young sunlike star (TOI-1726, HD 63433). H
Externí odkaz:
http://arxiv.org/abs/2401.04785
Autor:
Shariat, Cheyanne, Naoz, Smadar, Hansen, Bradley M. S., Angelo, Isabel, Michaely, Erez, Stephan, Alexander P.
The $Gaia$ mission has detected many white dwarfs (WDs) in binary and triple configurations, and while observations suggest that triple stellar systems are common in our Galaxy, not much attention was devoted to WDs in triples. For stability reasons,
Externí odkaz:
http://arxiv.org/abs/2306.13130
Autor:
Stephan, Alexander P., Gaudi, B. Scott
For the majority of short period exoplanets transiting massive stars with radiative envelopes, the spin angular momentum of the host star is greater than the planetary orbital angular momentum. In this case, the orbits of the planets will undergo nod
Externí odkaz:
http://arxiv.org/abs/2304.09890
Autor:
Fitzmaurice, Evan, Martin, David V., Martinez, Romy Rodriguez, Vallely, Patrick, Stephan, Alexander P., Boley, Kiersten M., Pogge, Rick, El-Badry, Kareem, Kunovac, Vedad, Triaud, Amaury H. M. J.
TOI-1259 consists of a transiting exoplanet orbiting a main sequence star, with a bound outer white dwarf companion. Less than a dozen systems with this architecture are known. We conduct follow-up spectroscopy on the white dwarf TOI-1259B using the
Externí odkaz:
http://arxiv.org/abs/2206.01259
Autor:
Angelo, Isabel, Naoz, Smadar, Petigura, Erik, MacDougall, Mason, Stephan, Alexander, Isaacson, Howard, Howard, Andrew W.
Highly eccentric orbits are one of the major surprises of exoplanets relative to the Solar System and indicate rich and tumultuous dynamical histories. One system of particular interest is Kepler-1656, which hosts a sub-Jovian planet with an eccentri
Externí odkaz:
http://arxiv.org/abs/2204.00019
Autor:
Stephan, Alexander P., Wang, Ji, Cauley, P. Wilson, Gaudi, B. Scott, Ilyin, Ilya, Johnson, Marshall C., Strassmeier, Klaus G.
Hot Jupiters orbiting rapidly rotating stars on inclined orbits undergo tidally induced nodal precession measurable over several years of observations. The Hot Jupiters WASP-33 b and KELT-9 b are particularly interesting targets as they are among the
Externí odkaz:
http://arxiv.org/abs/2203.02546