The Lantern Vol. 76, No. 2, Spring 2009

• Coffee and Morning • Charlie Brown Testifies at the Trial of Westley Allan Dodd, Convicted Child Killer • In a Women\u27s Bathroom • The Naming • An Urban Nightmare • In the Yellow Kitchen • City Streets • Engineering • Walter Bixby Walks Through Hunsberger Woods • Sing a Happy Tune • Apology • Will You Wear a Helmet?! • Molly Can\u27t Answer the Phone • Marked Man • He\u27s Under a Lot of Pressure • Ne Me Quitte Pas • Last Night • All of Our Second Hand Books are Lightly Wornhttps://digitalcommons.ursinus.edu/lantern/1174/thumbnail.jp

Non-detection of Helium in the upper atmospheres of TRAPPIST-1b, e and f

We obtained high-resolution spectra of the ultra-cool M-dwarf TRAPPIST-1 during the transit of its planet `b' using two high dispersion near-infrared spectrographs, IRD instrument on the Subaru 8.2m telescope and HPF instrument on the 10m Hobby-Eberly Telescope. These spectroscopic observations are complemented by a photometric transit observation for planet `b' using the APO/ARCTIC, which assisted us to capture the correct transit times for our transit spectroscopy. Using the data obtained by the new IRD and HPF observations, as well as the prior transit observations of planets `b', `e' and `f' from IRD, we attempt to constrain the atmospheric escape of the planet using the He I triplet 10830 {\AA} absorption line. We do not detect evidence for any primordial extended H-He atmospheres in all three planets. To limit any planet related absorption, we place an upper limit on the equivalent widths of <7.754 m{\AA} for planet `b', <10.458 m{\AA} for planet `e', and <4.143 m{\AA} for planet `f' at 95% confidence from the IRD data, and <3.467 m{\AA} for planet `b' at 95% confidence from HPF data. Using these limits along with a solar-like composition isothermal Parker wind model, we attempt to constrain the mass-loss rates for the three planets. For TRAPPIST-1b, our models exclude the highest possible energy-limited rate for a wind temperature <5000 K. This non-detection of extended atmospheres having low mean-molecular weight in all three planets aids in further constraining their atmospheric composition by steering the focus towards the search of high molecular weight species in their atmospheres.Comment: 11 pages; 4 figures; Accepted for publication in A

The Lantern, 2010-2011

• The Graterford Department of Corrections • Visiting Room: Lewis Considers the Space & Time Continuum • String • The Tale of Lad Wadley • The Devout • One Moment in the Garden • Water, Focused and Tumbling • Bomber • Another • I Walked Home • Perhe • I Describe the Last Time My Parents Had Sex • Butterflies • Ship Without Fools • The Interview • Cyane • An Imaginary Portrait of Stella as a Young Girl • At the Farm Market in Early Autumn • Victor Jorgenson\u27s Photograph of the V-J Day Kiss • Lightning • The Citadel • Whenever You Come Home From School • It Came in a Dream • What I Know About Fission • Please Don\u27t Fire Me for Saying Such Things • Femina Irata • Thank You For Shopping • Sunday, November 27th • An Introduction to The Lifestyle • Laid-Off Perception • Good-Night, Sweet Prince • Requiem for a Marriage • Gertrude\u27s Book • Passing • Elk Run II • Shady Tides • A Quiet House • Tell Him. A Manual • Silence • Google This • The Dinner Table Dance • The Inevitable Extinction of Filing Cabinets • Chateau d\u27If • Man Smoking in Charcoal • Inside Auschwitz • Bark Glow • Anticipation • Look Up • Major News Networks • Others Wage War • Insert Bible Verse Here • The Empress • Candy Castle • Venice, Italy • Quebec • Bhutanese Child • Jumper • Pomegranates • Cover Image: Octopus Hathttps://digitalcommons.ursinus.edu/lantern/1176/thumbnail.jp

The Lantern, 2009-2010

• I\u27m Pregnant. It\u27s Yours • The Nightmare • What Death Became After Cyparissus • Substances • Ain\u27t That a Man? • Portrait • The 100th Chemo • Looking into Her Toy Box with a Lover • They Used to Talk About Burning Cities • MESSAGE: Absence for Allen Ginsberg • Lunch with Candide • Behold! Man of Unbelief! Behold! • Dream #1 Final Strophe • Patience (Things You Will Discover) • Four Years • He Falls Like Leaves • The Quilt • Ariel (Turning Tricks at Fisherman\u27s Wharf, Monterey, California) • Extranjera • The Taste of Morning • Fear of Glory • The Rum Bottle\u27s Fortune • While Thinking of What to Write • Dying in Spring • Tutte le Eta di Firenze • Token • A House Grows Into Itself • Gravity • Father with the Skyy • He Says He Dreams of Me • Myth • Sun-Veins and Wishbones • Attempts at Bravery • One Boy in Four Parts • Blacktop Rollin\u27 • Getting My Feet Wet • The Long Ride After Ending • Wet Tongues and Sweaty Cotton • Norman Bates is My Mother • Sims Trek • Tomorrow Comes Today • The Writer\u27s Process • This Too Was Real • Venus from the Waves • Shark • Monday\u27s Expectations • Recognition • The Black Shoes • Climax • Andrew • Bottles • Calle de Cusco • God in the Machine • The 26th of December • Lollipop Lollipop • When Dinosaurs Roamed the Earth • Meaning • Jeffrey • Looking • Jagged Edges • Fading Storm • Shoes • Cover Image: Death by Chocolatehttps://digitalcommons.ursinus.edu/lantern/1175/thumbnail.jp

Early Ultraviolet Observations of Type IIn Supernovae Constrain the Asphericity of Their Circumstellar Material

We present a survey of the early evolution of 12 Type IIn supernovae (SNe IIn) at ultraviolet and visible light wavelengths. We use this survey to constrain the geometry of the circumstellar material (CSM) surrounding SN IIn explosions, which may shed light on their progenitor diversity. In order to distinguish between aspherical and spherical CSM, we estimate the blackbody radius temporal evolution of the SNe IIn of our sample, following the method introduced by Soumagnac et al. We find that higher-luminosity objects tend to show evidence for aspherical CSM. Depending on whether this correlation is due to physical reasons or to some selection bias, we derive a lower limit between 35% and 66% for the fraction of SNe IIn showing evidence for aspherical CSM. This result suggests that asphericity of the CSM surrounding SNe IIn is common—consistent with data from resolved images of stars undergoing considerable mass loss. It should be taken into account for more realistic modeling of these events

Homebodies

MFA theses in English Language and Literature are not available for direct download. Users wishing to access an MFA thesis in this collection may request access by clicking the link to the restricted file(s) and completing the request form. If we have contact information for the author, we will contact them and request permission to provide access. If we do not have contact information or the author denies or does not respond to our inquiry, we will not be able to provide access.A very short ambiguous novel10000-01-0

A conserved molecular switch in Class F receptors regulates receptor activation and pathway selection

Class F receptors are considered valuable therapeutic targets due to their role in human disease, but structural changes accompanying receptor activation remain unexplored. Employing population and cancer genomics data, structural analyses, molecular dynamics simulations, resonance energy transfer-based approaches and mutagenesis, we identify a conserved basic amino acid in TM6 in Class F receptors that acts as a molecular switch to mediate receptor activation. Across all tested Class F receptors (FZD(4,5,6,7,) SMO), mutation of the molecular switch confers an increased potency of agonists by stabilizing an active conformation as assessed by engineered mini G proteins as conformational sensors. Disruption of the switch abrogates the functional interaction between FZDs and the phosphoprotein Dishevelled, supporting conformational selection as a prerequisite for functional selectivity. Our studies reveal the molecular basis of a common activation mechanism conserved in all Class F receptors, which facilitates assay development and future discovery of Class F receptor-targeting drugs