Open Access. Powered by Scholars. Published by Universities.®
Other Astrophysics and Astronomy Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Discipline
- Keyword
-
- Astronomy (3)
- Atmosphere (2)
- Exoplanet (2)
- Transmission spectroscopy (2)
- Active galaxies (1)
-
- Blazars (1)
- Coordinates (1)
- Cosmic microwave background (1)
- Dark energy (1)
- Exoplanet atmosphere (1)
- Exoplanets (1)
- Forward modeling (1)
- Hot Jupiter (1)
- Ionosphere (1)
- Ionospheric disturbance (1)
- Ionospheric irregularities (1)
- Jets (1)
- Optical (1)
- Polar ionosphere (1)
- Radio (1)
- Scintillations (1)
- Solar-terrestrial interaction (1)
- Space and planetary sciences (1)
- Space weather (1)
- Tutorial (1)
- X-ray (1)
- Publication
- Publication Type
Articles 1 - 6 of 6
Full-Text Articles in Other Astrophysics and Astronomy
Hot Jupiter Atmospheres Through Time, Annabelle E. Niblett
Hot Jupiter Atmospheres Through Time, Annabelle E. Niblett
Physics and Astronomy Undergraduate Senior Theses
Transmission spectroscopy of hot Jupiters enables mass and atmospheric composition measurements, providing insight into population dynamics and evolution when other methods are hindered by stellar activity. To effectively plan observations and interpret transmission spectra, we must have a robust understanding of how atmospheres evolve over time. To that end, we present a suite of hot Jupiter transmission spectra models with ages ranging from 3 Myr to 11 Gyr. We incorporate the cooling and contraction of the planet, which impacts the atmospheric profile, and the evolution of the stellar UV spectrum, which moderates photodissociation and photoionization. Using PICASO, VULCAN, and FastChem …
Coordinates, Time, And The Sky, John R. Thorstensen
Coordinates, Time, And The Sky, John R. Thorstensen
Other Faculty Materials
This monograph explains celestial coordinates and their basis in the motion and orientation of the earth. It was written for use in undergraduate classes in basic astronomy and observational techniques.
Active Galactic Nuclei Across Scales: From Blazar Jets To Dark Matter Halos, Stephanie Ann Podjed
Active Galactic Nuclei Across Scales: From Blazar Jets To Dark Matter Halos, Stephanie Ann Podjed
Dartmouth College Ph.D Dissertations
Within ΛCDM, galaxies form and evolve within dark matter halos, with both central and satellite galaxies contributing to the total stellar mass content. Virtually every massive galaxy harbors a supermassive black hole (SMBH) at its center, with a small fraction of the population growing by actively accreting material; we call this an active galactic nucleus (AGN). The processes giving rise to an AGN phase (i.e., growth of a SMBH) releases enormous amounts of energy in the form of radiation, outflows, and relativistic jets that are able to significantly affect the formation and evolution of galaxies. Blazars are an extreme class …
Young Atmospheres Spiriting Away, Keighley Elizabeth Rockcliffe
Young Atmospheres Spiriting Away, Keighley Elizabeth Rockcliffe
Dartmouth College Ph.D Dissertations
The astronomy community has spectacularly achieved the first step in characterizing exoplanets: discovery. Over three decades of exoplanet detection have populated the Milky Way's exoplanet mosaic with thousands of planets, and more are on the way. Key trends within this mosaic reveal atmospheric escape as an underlying evolutionary process that has significantly shaped the population. While we are aware that atmospheric escape plays some role in exoplanet evolution, we do not know the extent of its influence, how it compares to other processes, and its specific physical mechanisms. Detailed studies of individual systems at known, young ages are direct tests …
Information Entropic Content Of Astrophysical Spectra: Applications To Cosmology And Astrobiology, Sara Vannah
Information Entropic Content Of Astrophysical Spectra: Applications To Cosmology And Astrobiology, Sara Vannah
Dartmouth College Ph.D Dissertations
Astrophysics faces two critical challenges: the difficulty of observing very distant targets and the difficulty of interpreting science in diverse and often extreme environments that have not been replicated on Earth. In this thesis, we discuss two types of spectra — one from early universe cosmology and one from astrobiology — where improvements in telescope technology are just ushering in a wave of precise observations, addressing the first challenge. This accelerates the need for a solution to the second challenge. Traditional methods for analyzing these two spectra rely heavily on unsettled science, biasing results to match the input assumptions. In …
Gps Phase Scintillation At High Latitudes During Geomagnetic Storms Of 7–17 March 2012 – Part 1: The North American Sector, P. Prikryl, R. Ghoddousi-Fard, E. G. Thomas, J. M. Ruohoniemi, S. G. Shepherd
Gps Phase Scintillation At High Latitudes During Geomagnetic Storms Of 7–17 March 2012 – Part 1: The North American Sector, P. Prikryl, R. Ghoddousi-Fard, E. G. Thomas, J. M. Ruohoniemi, S. G. Shepherd
Dartmouth Scholarship
During the ascending phase of solar cycle 24, a series of interplanetary coronal mass ejections (ICMEs) in the period 7–17 March 2012 caused geomagnetic storms that strongly affected high-latitude ionosphere in the Northern and Southern Hemisphere. GPS phase scintillation was observed at northern and southern high latitudes by arrays of GPS ionospheric scintillation and TEC monitors (GISTMs) and geodetic-quality GPS receivers sampling at 1 Hz. Mapped as a function of magnetic latitude and magnetic local time, regions of enhanced scintillation are identified in the context of coupling processes between the solar wind and the magnetosphere–ionosphere system. Large southward IMF and …