81 research outputs found
HST and Spitzer Observations of the HD 207129 Debris Ring
A debris ring around the star HD 207129 (G0V; d = 16.0 pc) has been imaged in
scattered visible light with the ACS coronagraph on the Hubble Space Telescope
and in thermal emission using MIPS on the Spitzer Space Telescope at 70 microns
(resolved) and 160 microns (unresolved). Spitzer IRS (7-35 microns) and MIPS
(55-90 microns) spectrographs measured disk emission at >28 microns. In the HST
image the disk appears as a ~30 AU wide ring with a mean radius of ~163 AU and
is inclined by 60 degrees from pole-on. At 70 microns it appears partially
resolved and is elongated in the same direction and with nearly the same size
as seen with HST in scattered light. At 0.6 microns the ring shows no
significant brightness asymmetry, implying little or no forward scattering by
its constituent dust. With a mean surface brightness of V=23.7 mag per square
arcsec, it is the faintest disk imaged to date in scattered light.Comment: 28 pages, 8 figure
Forecasting the Impact of Stellar Activity on Transiting Exoplanet Spectra
Exoplanet host star activity, in the form of unocculted starspots or faculae, alters the observed transmission and emission spectra of the exoplanet. This effect can be exacerbated when combining data from different epochs if the stellar photosphere varies between observations due to activity. Here, we present a method to characterize and correct for relative changes due to stellar activity by exploiting multi-epoch (⩾2 visits/transits) observations to place them in a consistent reference frame. Using measurements from portions of the planet's orbit where negligible planet transmission or emission can be assumed, we determine changes to the stellar spectral amplitude. With the analytical methods described here, we predict the impact of stellar variability on transit observations. Supplementing these forecasts with Kepler-measured stellar variabilities for F-, G-, K-, and M-dwarfs, and predicted transit precisions by the James Webb Space Telescope's (JWST) NIRISS, NIRCam, and MIRI, we conclude that stellar activity does not impact infrared transiting exoplanet observations of most presently known or predicted TESS targets by current or near-future platforms, such as JWST, as activity-induced spectral changes are below the measurement precision
The Vehicle, Fall 1983
Vol. 25, No. 1
Table of Contents
Amish BoyDevon Flesorpage 3
SyllogismJ. Maura Davispage 3
Ten SecondsD.L. Lewispage 4
The Cedar ChestBridget M. Howepage 4
A Christmas With CarolSteve Longpage 5
TeethMichelle Mitchellpage 7
An I-Love-You PoemD.L. Lewispage 8
The Dragon SlayerSusan Gradypage 8
A DefinitionAmy J. Eadespage 9
FingernailsSuzanne Hornpage 10
The Liar\u27s TableBrook Wilsonpage 10
Fifi\u27s Last PartySteve Longpage 12
Absence/PresenceSuzanne Hornpage 13
From the Rantings of a Mad Astronomy StudentAmy J. Eadespage 13
In the Name of the Father, the Son, and MachiavelliF. Link Rapierpage 15
Errant LoverBecky Lawsonpage 16
DaddyKevin Lylespage 16
GhostsGary Ervinpage 17
TangoF. Link Rapierpage 17
Grandma\u27s SlippersBecky Lawsonpage 18
EdgesAmy J. Eadespage 19
Having ChildrenDevon Flesorpage 20
Young Black GirlKevin Lylespage 21
CatSuzanne Hornpage 22
Breakfast for OneMichelle Mitchellpage 22
A Modest ProposalBrooke Sanfordpage 23
Post MortemF. Link Rapierpage 26
Who Said I Forgot?Lynne Krausepage 27
The Corner Booth at StuckeysMaggie Kennedypage 28
The First DayDavis Brydenpage 29
DownLynne Krausepage 30
Fairie RingDevon Flesorpage 31
The LaundrymatKathy Fordpage 32
Sunday in OctoberBridget M. Howepage 32
The Kitchen WindowMaggie Kennedypage 33
UntitledChristina Maire Vitekpage 34
8th Grade Field Trip to SpringfieldMichelle Mitchellpage 34
Children of the FortiesF. Link Rapierpage 35
one winter and i was eightGary Ervinpage 35
Don\u27t we all know?Thomas B. Waltrippage 36
The TravelerMaggie Kennedypage 36
The VisitKathy Fordpage 40
CubismMaggie Kennedypage 40https://thekeep.eiu.edu/vehicle/1042/thumbnail.jp
The Vehicle, Fall 1983
Vol. 25, No. 1
Table of Contents
Amish BoyDevon Flesorpage 3
SyllogismJ. Maura Davispage 3
Ten SecondsD.L. Lewispage 4
The Cedar ChestBridget M. Howepage 4
A Christmas With CarolSteve Longpage 5
TeethMichelle Mitchellpage 7
An I-Love-You PoemD.L. Lewispage 8
The Dragon SlayerSusan Gradypage 8
A DefinitionAmy J. Eadespage 9
FingernailsSuzanne Hornpage 10
The Liar\u27s TableBrook Wilsonpage 10
Fifi\u27s Last PartySteve Longpage 12
Absence/PresenceSuzanne Hornpage 13
From the Rantings of a Mad Astronomy StudentAmy J. Eadespage 13
In the Name of the Father, the Son, and MachiavelliF. Link Rapierpage 15
Errant LoverBecky Lawsonpage 16
DaddyKevin Lylespage 16
GhostsGary Ervinpage 17
TangoF. Link Rapierpage 17
Grandma\u27s SlippersBecky Lawsonpage 18
EdgesAmy J. Eadespage 19
Having ChildrenDevon Flesorpage 20
Young Black GirlKevin Lylespage 21
CatSuzanne Hornpage 22
Breakfast for OneMichelle Mitchellpage 22
A Modest ProposalBrooke Sanfordpage 23
Post MortemF. Link Rapierpage 26
Who Said I Forgot?Lynne Krausepage 27
The Corner Booth at StuckeysMaggie Kennedypage 28
The First DayDavis Brydenpage 29
DownLynne Krausepage 30
Fairie RingDevon Flesorpage 31
The LaundrymatKathy Fordpage 32
Sunday in OctoberBridget M. Howepage 32
The Kitchen WindowMaggie Kennedypage 33
UntitledChristina Maire Vitekpage 34
8th Grade Field Trip to SpringfieldMichelle Mitchellpage 34
Children of the FortiesF. Link Rapierpage 35
one winter and i was eightGary Ervinpage 35
Don\u27t we all know?Thomas B. Waltrippage 36
The TravelerMaggie Kennedypage 36
The VisitKathy Fordpage 40
CubismMaggie Kennedypage 40https://thekeep.eiu.edu/vehicle/1042/thumbnail.jp
Constraining Exoplanet Metallicities and Aerosols with ARIEL: An Independent Study by the Contribution to ARIEL Spectroscopy of Exoplanets (CASE) Team
Launching in 2028, ESA's Atmospheric Remote-sensing Exoplanet Large-survey
(ARIEL) survey of 1000 transiting exoplanets will build on the legacies
of Kepler and TESS and complement JWST by placing its high precision exoplanet
observations into a large, statistically-significant planetary population
context. With continuous 0.5--7.8~m coverage from both FGS (0.50--0.55,
0.8--1.0, and 1.0--1.2~m photometry; 1.25--1.95~m spectroscopy) and
AIRS (1.95--7.80~m spectroscopy), ARIEL will determine atmospheric
compositions and probe planetary formation histories during its 3.5-year
mission. NASA's proposed Contribution to ARIEL Spectroscopy of Exoplanets
(CASE) would be a subsystem of ARIEL's FGS instrument consisting of two
visible-to-infrared detectors, associated readout electronics, and thermal
control hardware. FGS, to be built by the Polish Academy of Sciences' Space
Research Centre, will provide both fine guiding and visible to near-infrared
photometry and spectroscopy, providing powerful diagnostics of atmospheric
aerosol contribution and planetary albedo, which play a crucial role in
establishing planetary energy balance. The CASE team presents here an
independent study of the capabilities of ARIEL to measure exoplanetary
metallicities, which probe the conditions of planet formation, and FGS to
measure scattering spectral slopes, which indicate if an exoplanet has
atmospheric aerosols (clouds and hazes), and geometric albedos, which help
establish planetary climate. Our design reference mission simulations show that
ARIEL could measure the mass-metallicity relationship of its 1000-planet
single-visit sample to and that FGS could distinguish between
clear, cloudy, and hazy skies and constrain an exoplanet's atmospheric aerosol
composition to for hundreds of targets, providing
statistically-transformative science for exoplanet atmospheres.Comment: accepted to PASP; 23 pages, 6 figure
Sorl1 as an Alzheimer's disease predisposition gene?
Alzheimer's disease (AD) is a neurodegenerative disorder characterized by progressively disabling impairments in memory, cognition, and non-cognitive behavioural symptoms. Sporadic AD is multifactorial and genetically complex. While several monogenic mutations cause early-onset AD and gene alleles have been suggested as AD susceptibility factors, the only extensively validated susceptibility gene for late-onset AD is the apolipoprotein E (APOE) epsilon4 allele. Alleles of the APOE gene do not account for all of the genetic load calculated to be responsible for AD predisposition. Recently, polymorphisms across the neuronal sortilin-related receptor (SORL1) gene were shown to be significantly associated with AD in several cohorts. Here we present the results of our large case-control whole-genome scan at over 500,000 polymorphisms which presents weak evidence for association and potentially narrows the association interval
The Vehicle, Fall 1984
Vol. 26, No. 1
Table of Contents
Thoughts on I-57Jim Caldwellpage 3
A Night Between Lonely and BlindJennifer K. Soulepage 4
What is Unnatural is Sometimes MagicAngelique Jenningspage 4
Cutting ClosenessBecky Lawsonpage 5
PhotoBrian Ormistonpage 6
The Sensuality of Corn One Week in AugustMichelle Mitchellpage 7
American MusicJim Caldwellpage 7
Water is WaitingMichael Kuopage 8
WhereJennifer K. Soulepage 8
The Fishing HoleJan Kowalskipage 9
Miller\u27s PondSue Gradypage 9
PhotoCathy Stonerpage 11
Young Man Reading To His LoverMaggie Kennedypage 11
ShellsChristopher R. Albinpage 12
In The ShadeJohn Fehrmannpage 12
FallLynanne Feilenpage 13
IndecisionDave L. Brydenpage 13
Dark Falls SoftlyAngelique Jenningspage 14
Not a Parked \u2757 Chevy in the Summer in the CountryMichelle Mitchellpage 20
BirdAnnie Heisepage 20
Clouds Created Only For Poets And Certain WomenJennifer K. Soulepage 21
SandGraham Lewispage 22
PhotoFred Zwickypage 23
Judgment CallCathy Moepage 23
I was hip that night Dan Hintzpage 24
A Sight Of WindDan Von Holtenpage 25
Tillard Isabel M. Parrottpage 26
The WidowMaggie Kennedypage 27
The SeparationMichelle Mitchellpage 27
The Garden Hose TrialMaggie Kennedypage 28
InterruptionsJennifer K. Soulepage 28
On Happening Across Jesus While Cleaning the BasementMaggie Kennedypage 29
GileonMichelle Mitchellpage 30
If My Father Were A Writer, He Would Still BuildAngelique Jenningspage 36
A Visit to Grandpa Gib\u27s HouseTammy Veachpage 37
For Having SeenAngelique Jenningspage 38
PhotoJudy Klancicpage 39
The Earth in BlueSusan J. Bielskypage 39
Things I Could Have SaidAngelique Jenningspage 40
AcrosticsAnnie Heisepage 40https://thekeep.eiu.edu/vehicle/1044/thumbnail.jp
The Vehicle, Fall 1984
Vol. 26, No. 1
Table of Contents
Thoughts on I-57Jim Caldwellpage 3
A Night Between Lonely and BlindJennifer K. Soulepage 4
What is Unnatural is Sometimes MagicAngelique Jenningspage 4
Cutting ClosenessBecky Lawsonpage 5
PhotoBrian Ormistonpage 6
The Sensuality of Corn One Week in AugustMichelle Mitchellpage 7
American MusicJim Caldwellpage 7
Water is WaitingMichael Kuopage 8
WhereJennifer K. Soulepage 8
The Fishing HoleJan Kowalskipage 9
Miller\u27s PondSue Gradypage 9
PhotoCathy Stonerpage 11
Young Man Reading To His LoverMaggie Kennedypage 11
ShellsChristopher R. Albinpage 12
In The ShadeJohn Fehrmannpage 12
FallLynanne Feilenpage 13
IndecisionDave L. Brydenpage 13
Dark Falls SoftlyAngelique Jenningspage 14
Not a Parked \u2757 Chevy in the Summer in the CountryMichelle Mitchellpage 20
BirdAnnie Heisepage 20
Clouds Created Only For Poets And Certain WomenJennifer K. Soulepage 21
SandGraham Lewispage 22
PhotoFred Zwickypage 23
Judgment CallCathy Moepage 23
I was hip that night Dan Hintzpage 24
A Sight Of WindDan Von Holtenpage 25
Tillard Isabel M. Parrottpage 26
The WidowMaggie Kennedypage 27
The SeparationMichelle Mitchellpage 27
The Garden Hose TrialMaggie Kennedypage 28
InterruptionsJennifer K. Soulepage 28
On Happening Across Jesus While Cleaning the BasementMaggie Kennedypage 29
GileonMichelle Mitchellpage 30
If My Father Were A Writer, He Would Still BuildAngelique Jenningspage 36
A Visit to Grandpa Gib\u27s HouseTammy Veachpage 37
For Having SeenAngelique Jenningspage 38
PhotoJudy Klancicpage 39
The Earth in BlueSusan J. Bielskypage 39
Things I Could Have SaidAngelique Jenningspage 40
AcrosticsAnnie Heisepage 40https://thekeep.eiu.edu/vehicle/1044/thumbnail.jp
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