Bulletin of the American Physical Society
Joint Fall 2017 Meeting of the Texas Section of the APS, Texas Section of the AAPT, and Zone 13 of the Society of Physics Students
Volume 62, Number 16
Friday–Saturday, October 20–21, 2017; The University of Texas at Dallas, Richardson, Texas
Session E1: Astro II |
Hide Abstracts |
Chair: Mustapha Ishak-Boushaki, University of Texas at Dallas Room: DGAC 1.102A |
Friday, October 20, 2017 4:15PM - 4:27PM |
E1.00001: Star Formation Histories of Extreme Emission Line Galaxies at z~3.5 in the ZFOURGE Survey Jonathan Cohn, Joel Leja, Kim-Vy Tran, Ben Forrest, Ben Johnson We analyze the properties of Extreme Emission Line Galaxies (EELGs) identified in the ZFOURGE survey at redshifts $2.5 \leq z \leq 4$. In this redshift range, ZFOURGE contains photometric data covering rest-frame wavelengths from the UV to the near-IR in the CDFS, COSMOS, and UDS fields. We use the \hbox{{\rm P}\kern0.1em{\sc rospector}-$\alpha$}~model to determine properties of our EELGs and compare them to properties of Lyman-break galaxies (LBGs) at similar redshifts. Specifically, we compare stacks of nonparametric star formation histories for EELGs and LBGs. We find that EELGs show little to no star formation until the most recent time bin before observation, when they undergo a strong burst of star formation activity. [Preview Abstract] |
Friday, October 20, 2017 4:27PM - 4:39PM |
E1.00002: Probing the debris disks of nearby stars with Fermi-LAT Alexander Riley, Louis Strigari, Troy Porter, Roger Blandford Many nearby stars are known to host circumstellar debris disks, similar to our Sun's asteroid and Kuiper belts, that are believed to be the birthplace of extrasolar planets. The bodies in these objects passively emit gamma radiation resulting from interactions with cosmic rays, as previously observed from measurements of the gamma ray albedo of the Moon. We apply a point source analysis to four nearby debris disks using the past nine years of data taken by Fermi-LAT, and report on the prospects for detecting gamma-ray emission from these sources. [Preview Abstract] |
Friday, October 20, 2017 4:39PM - 4:51PM |
E1.00003: Transit Evolution of HD189733b Philip Lenzen, Richard Olenick, Arthur Sweeney Significant physical parameters are known about the exoplanet HD189733b that was discovered in 2005: mass $m \quad =$ 1.142 Jupiter masses, period $P \quad =$ 2.21857 days, and semi-major axis $a \quad =$ 0.03142 AU for its orbit around the spectral type K star. We investigate the evolution of the transits through a combination of historical data and photometric data taken in 2017 in the R-band with a 16-in remote telescope at the Dark Skies Observatory Collaborative in West Texas. The data are reduced and modeled to extract measurements and to deduce transit parameters. We examine trends in the transit midpoint timing, depth, width and asymmetry of the curves of HD189733b. We present a summary of changes in these parameters in relation to heating and bow shock around the planet. [Preview Abstract] |
Friday, October 20, 2017 4:51PM - 5:03PM |
E1.00004: A Uniform Set of DAV Atmospheric Parameters Josh Fuchs, Bart Dunlap, Chris Clemens, JJ Hermes, Jesus Meza, Patrick O'Brien We have observed over 150 hydrogen-atmosphere dominated, pulsating white dwarfs (DAVs) using the Goodman Spectrograph on the SOAR Telescope. This includes all known DAVs south of +10$^{\circ}$ declination as well as those observed by the {\em K2} mission. Because it employs a single instrument, our sample allows us to carefully explore systematics in the determination of atmospheric parameters, $T_{eff}$ and $\log{g}$. While some systematics show changes of up to 300 K in $T_{eff}$ and 0.06 in log(g), the relative position of each star in the $T_{eff}$-$\log{g}$ plane is more secure. These relative positions, combined with differences in pulsation spectra, will allow us to investigate relative differences in the structure and composition of over 150 DAVs through differential seismology. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700