Zobrazeno 1 - 10
of 455
pro vyhledávání: '"Simon, Joshua D"'
Autor:
Simon, Joshua D., Li, Ting S., Ji, Alexander P., Pace, Andrew B., Hansen, Terese T., Cerny, William, Escala, Ivanna, Koposov, Sergey E., Drlica-Wagner, Alex, Mau, Sidney, Kirby, Evan N.
We present spectroscopy of the ultra-faint Milky Way satellites Eridanus III (Eri III) and DELVE 1. We identify eight member stars in each satellite and place non-constraining upper limits on their velocity and metallicity dispersions. The brightest
Externí odkaz:
http://arxiv.org/abs/2410.08276
Autor:
Galarza, Jhon Yana, Reggiani, Henrique, Ferreira, Thiago, Lorenzo-Oliveira, Diego, Simon, Joshua D., McWilliam, Andrew, Schlaufman, Kevin C., Miquelarena, Paula, Trivigno, Matias Flores, Arancibia, Marcelo Jaque
Over the last decade, studies of large samples of binary systems identified chemical anomalies, and showed that they might be attributed to planet formation or planet engulfment. However, both scenarios have primarily been tested in pairs without kno
Externí odkaz:
http://arxiv.org/abs/2407.20949
The discovery of a star formed out of pair-instability supernova ejecta would have massive implications for the Population III star initial mass function and the existence of stars over 100 Msun, but none have yet been found. Recently, the star LAMOS
Externí odkaz:
http://arxiv.org/abs/2404.17078
Autor:
Hansen, Terese T., Simon, Joshua D., Li, Ting S., Sharkey, Domani, Ji, Alexander P., Thompson, Ian B., Reggiani, Henrique M., Galarza, Jhon Yana
The growing number of Milky Way satellites detected in recent years has introduced a new focus for stellar abundance analysis. Abundances of stars in satellites have been used to probe the nature of these systems and their chemical evolution. However
Externí odkaz:
http://arxiv.org/abs/2403.13060
Autor:
Galarza, Jhon Yana, Ferreira, Thiago, Lorenzo-Oliveira, Diego, Simon, Joshua D., Reggiani, Henrique, Piro, Anthony L., Butler, R. Paul, Netto, Yuri, Valio, Adriana, Ciardi, David R., Safonov, Boris
Among Neptunian mass exoplanets ($20-50$ M$_\oplus$), puffy hot Neptunes are extremely rare, and their unique combination of low mass and extended radii implies very low density ($\rho < 0.3$~g~cm$^{-3}$). Over the last decade, only a few puffy plane
Externí odkaz:
http://arxiv.org/abs/2403.06240
Autor:
Ou, Xiaowei, Chiti, Anirudh, Shipp, Nora, Simon, Joshua D., Geha, Marla, Frebel, Anna, Mardini, Mohammad K., Erkal, Denis, Necib, Lina
The Hercules ultra-faint dwarf galaxy (UFD) has long been hypothesized to be tidally disrupting, yet no conclusive evidence has been found for tidal disruption owing partly to difficulties in identifying Hercules member stars. In this work, we presen
Externí odkaz:
http://arxiv.org/abs/2403.00921
Autor:
Richstein, Hannah, Kallivayalil, Nitya, Simon, Joshua D., Garling, Christopher T., Wetzel, Andrew, Warfield, Jack T., van der Marel, Roeland P., Jeon, Myoungwon, Rose, Jonah C., Torrey, Paul, Engelhardt, Anna Claire, Besla, Gurtina, Choi, Yumi, Geha, Marla, Guhathakurta, Puragra, Kirby, Evan N., Patel, Ekta, Sacchi, Elena, Sohn, Sangmo Tony
We present deep Hubble Space Telescope (HST) photometry of ten targets from Treasury Program GO-14734, including six confirmed ultra-faint dwarf galaxies (UFDs), three UFD candidates, and one likely globular cluster. Six of these targets are satellit
Externí odkaz:
http://arxiv.org/abs/2402.08731
Autor:
El-Badry, Kareem, Simon, Joshua D., Reggiani, Henrique, Rix, Hans-Walter, Latham, David W., Bieryla, Allyson, Buchhave, Lars A., Shahaf, Sahar, Mazeh, Tsevi, Chakrabarti, Sukanya, Guhathakurta, Puragra, Ilyin, Ilya V., Tauris, Thomas M.
We report discovery and characterization of a main-sequence G star orbiting a dark object with mass $1.90\pm 0.04 M_{\odot}$. The system was discovered via Gaia astrometry and has an orbital period of 731 days. We obtained multi-epoch RV follow-up ov
Externí odkaz:
http://arxiv.org/abs/2402.06722
The Faint Satellite System of NGC 253: Insights into Low-Density Environments and No Satellite Plane
Autor:
Mutlu-Pakdil, Burçin, Sand, David J., Crnojević, Denija, Bennet, Paul, Jones, Michael G., Spekkens, Kristine, Karunakaran, Ananthan, Zaritsky, Dennis, Caldwell, Nelson, Fielder, Catherine E., Guhathakurta, Puragra, Seth, Anil C., Simon, Joshua D., Strader, Jay, Toloba, Elisa
We have conducted a systematic search around the Milky Way (MW) analog NGC 253 (D=3.5 Mpc), as a part of the Panoramic Imaging Survey of Centaurus and Sculptor (PISCeS) - a Magellan+Megacam survey to identify dwarfs and other substructures in resolve
Externí odkaz:
http://arxiv.org/abs/2401.14457
Autor:
Chiti, Anirudh, Mardini, Mohammad, Limberg, Guilherme, Frebel, Anna, Ji, Alexander P., Reggiani, Henrique, Ferguson, Peter, Andales, Hillary Diane, Brauer, Kaley, Li, Ting S., Simon, Joshua D.
The Large Magellanic Cloud (LMC) is the Milky Way's most massive satellite galaxy, which only recently (~2 billion years ago) fell into our Galaxy. Since stellar atmospheres preserve their natal cloud's composition, the LMC's recent infall makes its
Externí odkaz:
http://arxiv.org/abs/2401.11307