Physical Sciences and Mathematics | Open Access Articles

A Collage Of Small Planets From The Lick–Carnegie Exoplanet Survey: Exploring The Super-Earth And Sub-Neptune Mass Regime, Jennifer Burt, Fabo Feng, Bradford Holden, Eric E. Mamajek, Chelsea X. Huang, Mickey M. Rosentha, Songhu Wang, R. Paul Butler, Steve S. Vogt, Gregory Laughlin, Gregory W. Henry, Johanna K. Teske, Sharon X. Wang, Jeffrey D. Crane, Steve A. Shectman

Information Systems and Engineering Management Research Publications

Analysis of new precision radial velocity (RV) measurements from the Lick Automated Planet Finder and Keck HIRES has yielded the discovery of three new exoplanet candidates orbiting the nearby stars HD 190007 and HD 216520. We also report new velocities from the APF and the Planet Finder Spectrograph and updated orbital fits for the known exoplanet host stars GJ 686 and HD 180617. Of the newly discovered planets, HD 190007 b has a period of P = 11.72 days, an RV semiamplitude of K = 5.64 ± 0.55 m s−1, a minimum mass of Mpl = 16.46 ± 1.66 M⊕, …

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Kelt-25 B And Kelt-26 B: A Hot Jupiter And A Substellar Companion Transiting Young A Stars Observed By Tess, R. R. Martínez, R. R. Martínez, B. S. Gaudi, J. E. Rodriguez, G. Zhou, J. Labadie-Bartz, S. N. Quinn, K. Penev, T.-G. Tan, D. W. Latham, L. A. Paredes, J. F. Kielkopf, B. Addison, D. J. Wright, J. Teske, S. B. Howell, D. Ciardi, C. Ziegler, K. G. Stassun, M. C. Johnson, J. D. Eastman, R. J. Siverd, T. G. Beatty, L. Bouma, T. Bedding, J. Pepper, J. Winn, M. B. Lund, S. Villanueva Jr., D. J. Stevens, Eric L.N. Jensen, C. Kilby, J. D. Crane, A. Tokovinin, M. E. Everett, C. G. Tinney, M. Fausnaugh, David H. Cohen, D. Bayliss, A. Bieryla, P. A. Cargile, K. A. Collins, D. M. Conti, K. D. Colón, I. A. Curtis, D. L. Depoy, P. Evans, D. L. Feliz, J. Gregorio, J. Rothenberg, D. J. James, M. D. Joner, R. B. Kuhn, M. Manner, S. Khakpash, J. L. Marshall, K. K. Mcleod, M. T. Penny, P. A. Reed, H. M. Relles, D. C. Stephens, C. Stockdale, M. Trueblood, P. Trueblood, X. Yao, R. Zambelli, R. Vanderspek, S. Seager, J. M. Jenkins, T. J. Henry, H.-S. James, W.-C. Jao, S. X. Wang, P. Butler, I. Thompson, S. Schectman, R. Wittenmyer, B. P. Bowler, J. Horner, S. R. Kane, M. W. Mengel, T. D. Morton, J. Okumura, P. Plavchan, H. Zhang, N. J. Scott, R. A. Matson, A. W. Mann, D. Dragomir, M. Günther, E. B. Ting, A. Glidden, E. V. Quintana

Physics & Astronomy Faculty Works

We present the discoveries of KELT-25 b (TIC 65412605, TOI-626.01) and KELT-26 b (TIC 160708862, TOI-1337.01), two transiting companions orbiting relatively bright, early A stars. The transit signals were initially detected by the KELT survey and subsequently confirmed by Transiting Exoplanet Survey Satellite (TESS) photometry. KELT-25 b is on a 4.40 day orbit around the V = 9.66 star CD-24 5016 (${T}_{\mathrm{eff}}={8280}_{-180}^{+440}$ K, Msstarf = ${2.18}_{-0.11}^{+0.12}$ M⊙), while KELT-26 b is on a 3.34 day orbit around the V = 9.95 star HD 134004 (${T}_{\mathrm{eff}}$ = ${8640}_{-240}^{+500}$K, Msstarf = ${1.93}_{-0.16}^{+0.14}$M⊙), which is likely an Am star. We have confirmed the …

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Tess Reveals A Short-Period Sub-Neptune Sibling (Hd 86226c) To A Known Long-Period Giant Planet, J. Teske, M. R. Díaz, R. Luque, T. Močnik, J. V. Seidel, J. F. Otegi, F. Feng, J. S. Jenkins, E. Pallè, D. Ségransan, S. Udry, K. A. Collins, J. D. Eastman, G. R. Ricker, R. Vanderspek, D. W. Latham, S. Seager, J. N. Winn, J. M. Jenkins, D. R. Anderson, T. Barclay, F. Bouchy, J. A. Burt, R. P. Butler, D. A. Caldwell, K. I. Collins, J. D. Crane, C. Dorn, E. Flowers, J. Haldemann, R. Helled, C. Hellier, Eric L.N. Jensen, S. R. Kane, N. Law, J. J. Lissauer, A. W. Mann, M. Marmier, L. D. Nielsen, M. E. Rose, S. A. Shectman, A. Shporer, G. Torres, S. X. Wang, A. Wolfgang, I. Wong, C. Ziegler

Physics & Astronomy Faculty Works

The Transiting Exoplanet Survey Satellite mission was designed to find transiting planets around bright, nearby stars. Here, we present the detection and mass measurement of a small, short-period (≈4 days) transiting planet around the bright (V = 7.9), solar-type star HD 86226 (TOI-652, TIC 22221375), previously known to host a long-period (~1600 days) giant planet. HD 86226c (TOI-652.01) has a radius of 2.16 ± 0.08 R⊕ and a mass of ${7.25}_{-1.12}^{+1.19}$M⊕, based on archival and new radial velocity data. We also update the parameters of the longer-period, not-known-to-transit planet, and find it to be less eccentric and less massive than …

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Expres. I. Hd 3651 As An Ideal Rv Benchmark, John M. Brewer, Debra A. Fischer, Ryan T. Blackman, Samuel H. C. Cabot, Allen B. Davis, Gregory Laughlin, Christopher Leet, J. M. Joel Ong, Ryan R. Petersburg, Andrew E. Szymkowiak, Lily L. Zhao, Gregory W. Henry, Joe Llama

Information Systems and Engineering Management Research Publications

The next generation of exoplanet-hunting spectrographs should deliver up to an order of magnitude improvement in radial velocity (RV) precision over the standard 1 ${\rm{m}}\ {{\rm{s}}}^{-1}$ state-of-the-art spectrographs. This advance is critical for enabling the detection of Earth-mass planets around Sun-like stars. New calibration techniques such as laser frequency combs and stabilized etalons ensure that the instrumental stability is well characterized. However, additional sources of error include stellar noise, undetected short-period planets, and telluric contamination. To understand and ultimately mitigate error sources, the contributing terms in the error budget must be isolated to the greatest extent possible. Here, we introduce …

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The Planetary Luminosity Problem: " Missing Planets" And The Observational Consequences Of Episodi Accretion, Sean D. Brittain, Joan R. Najita, Ruobing Dong, Zhaohuan Zhu

Physics & Astronomy Faculty Research

The high occurrence rates of spiral arms and large central clearings in protoplanetary disks, if interpreted as signposts of giant planets, indicate that gas giants commonly form as companions to young stars (Myr) at orbital separations of 10–300 au. However, attempts to directly image this giant planet population as companions to more mature stars (>10 Myr) have yielded few successes. This discrepancy could be explained if most giant planets form by "cold start," i.e., by radiating away much of their formation energy as they assemble their mass, rendering them faint enough to elude detection at later times. In that …

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Optical To Near-Infrared Transmission Spectrum Of The Warm Sub-Saturn Hat-P-12b, Ian Wong, Björn Benneke, Peter Gao, Heather Knutson, Yayaati Chachan, Gregory W. Henry, Drake Deming, Tiffany Kataria, Elspeth K. H. Lee, Nikolay Nikolov, David K. Sing, Gilda E. Ballester, Nathaniel J. Baskin, Hannah R. Wakeford, Michael H. Williamson

Information Systems and Engineering Management Research Publications

We present the transmission spectrum of HAT-P-12b through a joint analysis of data obtained from the Hubble Space Telescope Space Telescope Imaging Spectrograph and Wide Field Camera 3 and Spitzer, covering the wavelength range 0.3–5.0 μm. We detect a muted water vapor absorption feature at 1.4 μm attenuated by clouds, as well as a Rayleigh scattering slope in the optical indicative of small particles. We interpret the transmission spectrum using both the state-of-the-art atmospheric retrieval code SCARLET and the aerosol microphysics model CARMA. These models indicate that the atmosphere of HAT-P-12b is consistent with a broad range of metallicities between …

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Evaluating Climate Variability Of The Canonical Hot-Jupiters Hd 189733b And Hd 209458b Through Multi-Epoch Eclipse Observations, Brian M. Kilpatrick, Tiffany Kataria, Nikole K. Lewis, Robert T. Zellem, Gregory W. Henry, Nicolas B. Cowan, Julien De Wit, Jonathan J. Fortney, Heather Knutson, Sara Seager, Adam P. Showman, Gregory S. Tucker

Information Systems and Engineering Management Research Publications

Here we present the analysis of multi-epoch secondary eclipse observations of HD 189733b and HD 209458b as a probe of temporal variability in the planetary climate using both Spitzer channels 1 and 2 (3.6 and 4.5 μm). We expect hot-Jupiter atmospheres to be dynamic environments exhibiting time varying weather. However, it is uncertain to what extent temporal variability will be observable when considering disk integrated observations. We do not detect statistically significant variability and are able to place useful upper limits on the infrared variability amplitudes in these atmospheres. There are very few planets with multi-epoch observations at the required …

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Physics & Astronomy Faculty Works

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Expres. I. Hd 3651 As An Ideal Rv Benchmark, John M. Brewer, Debra A. Fischer, Ryan T. Blackman, Samuel H. C. Cabot, Allen B. Davis, Gregory Laughlin, Christopher Leet, J. M. Joel Ong, Ryan R. Petersburg, Andrew E. Szymkowiak, Lily L. Zhao, Gregory W. Henry, Joe Llama

Information Systems and Engineering Management Research Publications

The Planetary Luminosity Problem: " Missing Planets" And The Observational Consequences Of Episodi Accretion, Sean D. Brittain, Joan R. Najita, Ruobing Dong, Zhaohuan Zhu

Physics & Astronomy Faculty Research

Information Systems and Engineering Management Research Publications

Information Systems and Engineering Management Research Publications