WASP-12b: THE HOTTEST TRANSITING
... −0.15 ), late-F (Teff = 6300−100 K) star which is evolving off the zero-age main sequence. The planet has an equilibrium temperature of Teq = 2516 K caused by its very short period orbit (P = 1.09 days) around the hot, twelfth magnitude host star. WASP-12b has the largest radius of any transiting pl ...
... −0.15 ), late-F (Teff = 6300−100 K) star which is evolving off the zero-age main sequence. The planet has an equilibrium temperature of Teq = 2516 K caused by its very short period orbit (P = 1.09 days) around the hot, twelfth magnitude host star. WASP-12b has the largest radius of any transiting pl ...
FORMATION OF LATE-TYPE SPIRAL GALAXIES: GAS RETURN
... The galaxy is initialized at z = 5 as a very gas-rich disk, with a gas fraction of 0.5 with respect to total baryonic mass. The initial dark halo follows a Burkert profile with a core radius of 5.9 kpc and a truncation radius of 13.8 kpc. Gas and stars are in a disk with exponential scale lengths of ...
... The galaxy is initialized at z = 5 as a very gas-rich disk, with a gas fraction of 0.5 with respect to total baryonic mass. The initial dark halo follows a Burkert profile with a core radius of 5.9 kpc and a truncation radius of 13.8 kpc. Gas and stars are in a disk with exponential scale lengths of ...
Earth in Space - Learning Outcomes
... The two tides per day that we observe are caused by the unequal attractions of the Moon (and Sun) for masses at different sides of the Earth. In addition the rotation of the Earth and Moon also has an effect on tidal patterns. The Sun causes two tides per day and the Moon causes two tides every 25 h ...
... The two tides per day that we observe are caused by the unequal attractions of the Moon (and Sun) for masses at different sides of the Earth. In addition the rotation of the Earth and Moon also has an effect on tidal patterns. The Sun causes two tides per day and the Moon causes two tides every 25 h ...
key - Scioly.org
... For this competition you have learned about type Ia Supernovae, but and not all type Ia events are the same. For this essay, compare and contrast the different theories for how a type Ia supernova could be generated. If possible, show an “evolution” of theories from the past to the present. Be certa ...
... For this competition you have learned about type Ia Supernovae, but and not all type Ia events are the same. For this essay, compare and contrast the different theories for how a type Ia supernova could be generated. If possible, show an “evolution” of theories from the past to the present. Be certa ...
Exploration géochimique du Système Solaire
... objects ? (internal composition ? Volatiles ? Thick atmosphere ?) Orbiting a bright star (V=7.7,K=5.7) very important for future atmospheric characterization (JWST,…) Formation of such a planet ? Characterizing the host star (mass, radius, age) is essential ...
... objects ? (internal composition ? Volatiles ? Thick atmosphere ?) Orbiting a bright star (V=7.7,K=5.7) very important for future atmospheric characterization (JWST,…) Formation of such a planet ? Characterizing the host star (mass, radius, age) is essential ...
16.1 A Little History
... Figure 16.1: Image of the faint supernova remnant Simeis 147. This Type II supernova exploded ∼ 100 000 years ago, leaving behind a spinning neutron star or pulsar. Its remnant now extends over nearly three degrees on the sky in the constellation of Taurus. ...
... Figure 16.1: Image of the faint supernova remnant Simeis 147. This Type II supernova exploded ∼ 100 000 years ago, leaving behind a spinning neutron star or pulsar. Its remnant now extends over nearly three degrees on the sky in the constellation of Taurus. ...
NATIONAL STANDARDS SCIENCE AS INQUIRY
... generally predictable ways because of the gravitational attraction between the stars. Scientists knew that if they saw a single star moving as if there were a massive object nearby, but with no other star in evidence, then its invisible companion could be a black hole. Scientists also realized that ...
... generally predictable ways because of the gravitational attraction between the stars. Scientists knew that if they saw a single star moving as if there were a massive object nearby, but with no other star in evidence, then its invisible companion could be a black hole. Scientists also realized that ...
aaswinter07ppt
... In January 2002, the star V838 Monocerotis erupted, generating intense interest, at least partly because of the exquisite pictures taken by the Hubble Space Telescope (see the background of this poster and the color picture below) ACS showing what is interpreted as a “light echo” from the eruption ( ...
... In January 2002, the star V838 Monocerotis erupted, generating intense interest, at least partly because of the exquisite pictures taken by the Hubble Space Telescope (see the background of this poster and the color picture below) ACS showing what is interpreted as a “light echo” from the eruption ( ...
The Antares Emission Nebula and Mass Loss of α Sco A
... that faint [Fe II] emission is seen all along the slit, i.e. in the neutral M star wind. The explanation comes from the observation that one of the allowed lines, Fe II 5169 Å, appears both in the neutral wind (position 0.9 from the M star) and in the H II region. Apparently one channel for the exc ...
... that faint [Fe II] emission is seen all along the slit, i.e. in the neutral M star wind. The explanation comes from the observation that one of the allowed lines, Fe II 5169 Å, appears both in the neutral wind (position 0.9 from the M star) and in the H II region. Apparently one channel for the exc ...
Letter to the Editor The formation of bipolar planetary nebulae
... consists of two parts (Paczyński 1971). Initially the star contracts, evolving to higher effective temperatures at a constant luminosity; then as the energy production stops, the luminosity starts decreasing and the effective temperature starts dropping. The star reaches its highest temperature (se ...
... consists of two parts (Paczyński 1971). Initially the star contracts, evolving to higher effective temperatures at a constant luminosity; then as the energy production stops, the luminosity starts decreasing and the effective temperature starts dropping. The star reaches its highest temperature (se ...
ppt - SLAC
... 2. Atmospheric pressure depends on the star's surface gravity and so, roughly, on its size —a giant, dwarf, or in between. The size and surface brightness yield the star's luminosity and often its evolutionary status (young, middle-aged, or nearing death). Apparent brightness then gives an idea of t ...
... 2. Atmospheric pressure depends on the star's surface gravity and so, roughly, on its size —a giant, dwarf, or in between. The size and surface brightness yield the star's luminosity and often its evolutionary status (young, middle-aged, or nearing death). Apparent brightness then gives an idea of t ...
An absence of ex-companion stars in the type Ia supernova remnant
... any ex-companion star to deep limits rules out all published singledegenerate models for this supernova. The only remaining possibility is that the progenitor of this particular type Ia supernova was a double-degenerate system. The progenitor of any type Ia supernova has never been identified. Vario ...
... any ex-companion star to deep limits rules out all published singledegenerate models for this supernova. The only remaining possibility is that the progenitor of this particular type Ia supernova was a double-degenerate system. The progenitor of any type Ia supernova has never been identified. Vario ...
A radio-pulsing white dwarf binary star
... White dwarfs are not born spinning rapidly24 , and a prior stage of accretion-driven spin-up is required. Depending upon the distance at which the accreting material coupled to the white dwarf’s magnetic field, between 0.002 M and 0.015 M of matter are required to reach PS = 1.95 min. For an accre ...
... White dwarfs are not born spinning rapidly24 , and a prior stage of accretion-driven spin-up is required. Depending upon the distance at which the accreting material coupled to the white dwarf’s magnetic field, between 0.002 M and 0.015 M of matter are required to reach PS = 1.95 min. For an accre ...
the magellanic clouds newsletter - Keele University Astrophysics
... in the ten HMXBs are also provided, as well as the long-term lightcurves folded on the sources best determined orbital parameters. These lightcurves reveal complex eclipse ingresses and egresses, that are understood mostly as being due to the presence of accretion wakes. The results reported in this ...
... in the ten HMXBs are also provided, as well as the long-term lightcurves folded on the sources best determined orbital parameters. These lightcurves reveal complex eclipse ingresses and egresses, that are understood mostly as being due to the presence of accretion wakes. The results reported in this ...
15.1 Introduction
... the narrow absorption lines that are typical of ‘normal’ stars (Figure 15.3). The emission lines are so strong that they were first noticed as early as 1867 by... Charles Wolf and Georges Rayet (!) using the 40 cm Foucault telescope at the Paris Observatory. Nowadays, this characteristic is exploite ...
... the narrow absorption lines that are typical of ‘normal’ stars (Figure 15.3). The emission lines are so strong that they were first noticed as early as 1867 by... Charles Wolf and Georges Rayet (!) using the 40 cm Foucault telescope at the Paris Observatory. Nowadays, this characteristic is exploite ...
PHYSICAL PROPERTIES OF THE AXP 4U 0142+61 FROM X
... AXPs and SGRs are all observed as point X-ray sources with luminosities of 1033 Y1036 erg s1. Their X-ray spectra, in the 0.5Y 10.0 keV photon energy range, have so far been described by empirical functions such as a blackbody (kT 0:3Y 0.6 keV ) plus a power law (with photon index 2:5Y4) and, l ...
... AXPs and SGRs are all observed as point X-ray sources with luminosities of 1033 Y1036 erg s1. Their X-ray spectra, in the 0.5Y 10.0 keV photon energy range, have so far been described by empirical functions such as a blackbody (kT 0:3Y 0.6 keV ) plus a power law (with photon index 2:5Y4) and, l ...
AGN in hierarchical galaxy formation models
... Gas accreted via an accretion disk transfers its angular momentum at the last stable orbit to the BH: • Co-rotating gas – spin up • Counter-rotating gas – spin down ...
... Gas accreted via an accretion disk transfers its angular momentum at the last stable orbit to the BH: • Co-rotating gas – spin up • Counter-rotating gas – spin down ...
EvoluGon of high mass stars Solar-‐type stars end their lives by
... This energy loss can be compensated for by increasing the rate of fusion reac=ons, un=l an Fe core is formed. The only way in which internal energy can be generated in this core is for grav ...
... This energy loss can be compensated for by increasing the rate of fusion reac=ons, un=l an Fe core is formed. The only way in which internal energy can be generated in this core is for grav ...
The Milky Way
... In order to get a good outside view of the Milky Way, you are trying to send a spacecraft high above the plane of the Milky Way, to a height equal to our distance from the Galactic center. If you had a spacecraft that could travel at almost the speed of light, how long would it take it to get there ...
... In order to get a good outside view of the Milky Way, you are trying to send a spacecraft high above the plane of the Milky Way, to a height equal to our distance from the Galactic center. If you had a spacecraft that could travel at almost the speed of light, how long would it take it to get there ...
HuntingNoAnim
... The gravitational field of a black hole tugs on the stars in its vicinity. A super-massive black hole will make whole swarms of stars whip around as they fall under its influence. By following the motions of the orbiting stars, astronomers can deduce the location, and size, of the central black hole ...
... The gravitational field of a black hole tugs on the stars in its vicinity. A super-massive black hole will make whole swarms of stars whip around as they fall under its influence. By following the motions of the orbiting stars, astronomers can deduce the location, and size, of the central black hole ...
Star Formation Legacy of the Hubble Space Telescope Outline of Talk
... • High dynamic range - Very stable PSF; can subtract modeled or empirical PSF to gain large factor in wings of PSF; ACS/NICMOS coronagraphs gain an additional factor of a few • 2 gyro mode coming very soon; minimal impact for ...
... • High dynamic range - Very stable PSF; can subtract modeled or empirical PSF to gain large factor in wings of PSF; ACS/NICMOS coronagraphs gain an additional factor of a few • 2 gyro mode coming very soon; minimal impact for ...
Dancing with Stars 3 Dancing with Stars Binary Stellar Evolution 1
... become a red giant. The Algol system is presumably in this slow mass transfer phase. 6. Large Separation When the two stars are of relatively large separation, but still close enough to qualify as a “close” binary, mass transfer does not begin until the more massive star has become nearly a full-fle ...
... become a red giant. The Algol system is presumably in this slow mass transfer phase. 6. Large Separation When the two stars are of relatively large separation, but still close enough to qualify as a “close” binary, mass transfer does not begin until the more massive star has become nearly a full-fle ...
Cygnus X-1
Cygnus X-1 (abbreviated Cyg X-1) is a well-known galactic X-ray source, thought to be a black hole, in the constellation Cygnus. It was discovered in 1964 during a rocket flight and is one of the strongest X-ray sources seen from Earth, producing a peak X-ray flux density of 6977229999999999999♠2.3×10−23 Wm−2 Hz−1 (7003230000000000000♠2.3×103 Jansky). Cygnus X-1 was the first X-ray source widely accepted to be a black hole and it remains among the most studied astronomical objects in its class. The compact object is now estimated to have a mass about 14.8 times the mass of the Sun and has been shown to be too small to be any known kind of normal star, or other likely object besides a black hole. If so, the radius of its event horizon is about 7004440000000000000♠44 km.Cygnus X-1 belongs to a high-mass X-ray binary system about 7019574266339685654♠6070 ly from the Sun that includes a blue supergiant variable star designated HDE 226868 which it orbits at about 0.2 AU, or 20% of the distance from the Earth to the Sun. A stellar wind from the star provides material for an accretion disk around the X-ray source. Matter in the inner disk is heated to millions of degrees, generating the observed X-rays. A pair of jets, arranged perpendicular to the disk, are carrying part of the energy of the infalling material away into interstellar space.This system may belong to a stellar association called Cygnus OB3, which would mean that Cygnus X-1 is about five million years old and formed from a progenitor star that had more than 7001400000000000000♠40 solar masses. The majority of the star's mass was shed, most likely as a stellar wind. If this star had then exploded as a supernova, the resulting force would most likely have ejected the remnant from the system. Hence the star may have instead collapsed directly into a black hole.Cygnus X-1 was the subject of a friendly scientific wager between physicists Stephen Hawking and Kip Thorne in 1975, with Hawking betting that it was not a black hole. He conceded the bet in 1990 after observational data had strengthened the case that there was indeed a black hole in the system. This hypothesis has not been confirmed due to a lack of direct observation but has generally been accepted from indirect evidence.