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Why is there a Phillips relation?
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I want to know the explanation of Phillips relation, the relation seen in type Ia supernovae(SN Ia with broader light curve is brighter). More Ni-56 implies a larger luminosity at peak but what about broader light curve?
supernova
edited 3 hours ago
James K
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Noriaki822
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up vote
3
down vote
favorite
I want to know the explanation of Phillips relation, the relation seen in type Ia supernovae(SN Ia with broader light curve is brighter). More Ni-56 implies a larger luminosity at peak but what about broader light curve?
supernova
edited 3 hours ago
James K
30.1k243100
asked 5 hours ago
Noriaki822
262
New contributor
Noriaki822 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
There isn't, to my knowledge, an accepted theoretical explanation, but there are several hypotheses. Adam Burrows has these helpful slides on the topic.
– pela
5 hours ago
add a comment |Â
up vote
3
down vote
favorite
up vote
3
down vote
favorite
I want to know the explanation of Phillips relation, the relation seen in type Ia supernovae(SN Ia with broader light curve is brighter). More Ni-56 implies a larger luminosity at peak but what about broader light curve?
supernova
edited 3 hours ago
James K
30.1k243100
asked 5 hours ago
Noriaki822
262
New contributor
Noriaki822 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I want to know the explanation of Phillips relation, the relation seen in type Ia supernovae(SN Ia with broader light curve is brighter). More Ni-56 implies a larger luminosity at peak but what about broader light curve?
supernova
supernova
edited 3 hours ago
James K
30.1k243100
asked 5 hours ago
Noriaki822
262
New contributor
Noriaki822 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 3 hours ago
James K
30.1k243100
asked 5 hours ago
Noriaki822
262
New contributor
Noriaki822 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 3 hours ago
James K
30.1k243100
edited 3 hours ago
James K
30.1k243100
edited 3 hours ago
James K
30.1k243100
30.1k243100
asked 5 hours ago
Noriaki822
262
New contributor
Noriaki822 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 5 hours ago
Noriaki822
262
asked 5 hours ago
Noriaki822
262
262
New contributor
Noriaki822 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Noriaki822 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Noriaki822 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
There isn't, to my knowledge, an accepted theoretical explanation, but there are several hypotheses. Adam Burrows has these helpful slides on the topic.
– pela
5 hours ago
add a comment |Â
There isn't, to my knowledge, an accepted theoretical explanation, but there are several hypotheses. Adam Burrows has these helpful slides on the topic.
– pela
5 hours ago
There isn't, to my knowledge, an accepted theoretical explanation, but there are several hypotheses. Adam Burrows has these helpful slides on the topic.
– pela
5 hours ago
There isn't, to my knowledge, an accepted theoretical explanation, but there are several hypotheses. Adam Burrows has these helpful slides on the topic.
– pela
5 hours ago
add a comment |Â
1 Answer
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Check this paper: http://adsabs.harvard.edu/abs/2001ASPC..229..287M
LargerNi-56 directly implies brighter at peak, since it is the dominant source of radiation energy at early times.
The broadness of a light curve depends on the light curve timescale, which depends on ejecta mass, opacity, and kinetic energy. Since SNe Ia are from WD progenitors, there are not much different in ejecta mass. From simulations, kinetic energy is roughly the same across broad parameters. This leaves opacity to be the origin of the broadness. Since Fe-group elements have higher opacity than intermediate mass elements (IME), and more Ni-56 implies more Fe-group/IME, it is to be expected that high Ni-56 implies high opacity that implies broader light curve.
The slide, that someone provided in your comment, explains the same idea here (with more references).
answered 1 hour ago
Kornpob Bhirombhakdi
5885
add a comment |Â
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
Check this paper: http://adsabs.harvard.edu/abs/2001ASPC..229..287M
LargerNi-56 directly implies brighter at peak, since it is the dominant source of radiation energy at early times.
The broadness of a light curve depends on the light curve timescale, which depends on ejecta mass, opacity, and kinetic energy. Since SNe Ia are from WD progenitors, there are not much different in ejecta mass. From simulations, kinetic energy is roughly the same across broad parameters. This leaves opacity to be the origin of the broadness. Since Fe-group elements have higher opacity than intermediate mass elements (IME), and more Ni-56 implies more Fe-group/IME, it is to be expected that high Ni-56 implies high opacity that implies broader light curve.
The slide, that someone provided in your comment, explains the same idea here (with more references).
answered 1 hour ago
Kornpob Bhirombhakdi
5885
add a comment |Â
up vote
2
down vote
Check this paper: http://adsabs.harvard.edu/abs/2001ASPC..229..287M
LargerNi-56 directly implies brighter at peak, since it is the dominant source of radiation energy at early times.
The broadness of a light curve depends on the light curve timescale, which depends on ejecta mass, opacity, and kinetic energy. Since SNe Ia are from WD progenitors, there are not much different in ejecta mass. From simulations, kinetic energy is roughly the same across broad parameters. This leaves opacity to be the origin of the broadness. Since Fe-group elements have higher opacity than intermediate mass elements (IME), and more Ni-56 implies more Fe-group/IME, it is to be expected that high Ni-56 implies high opacity that implies broader light curve.
The slide, that someone provided in your comment, explains the same idea here (with more references).
answered 1 hour ago
Kornpob Bhirombhakdi
5885
add a comment |Â
up vote
2
down vote
up vote
2
down vote
Check this paper: http://adsabs.harvard.edu/abs/2001ASPC..229..287M
LargerNi-56 directly implies brighter at peak, since it is the dominant source of radiation energy at early times.
The broadness of a light curve depends on the light curve timescale, which depends on ejecta mass, opacity, and kinetic energy. Since SNe Ia are from WD progenitors, there are not much different in ejecta mass. From simulations, kinetic energy is roughly the same across broad parameters. This leaves opacity to be the origin of the broadness. Since Fe-group elements have higher opacity than intermediate mass elements (IME), and more Ni-56 implies more Fe-group/IME, it is to be expected that high Ni-56 implies high opacity that implies broader light curve.
The slide, that someone provided in your comment, explains the same idea here (with more references).
answered 1 hour ago
Kornpob Bhirombhakdi
5885
Check this paper: http://adsabs.harvard.edu/abs/2001ASPC..229..287M
LargerNi-56 directly implies brighter at peak, since it is the dominant source of radiation energy at early times.
The broadness of a light curve depends on the light curve timescale, which depends on ejecta mass, opacity, and kinetic energy. Since SNe Ia are from WD progenitors, there are not much different in ejecta mass. From simulations, kinetic energy is roughly the same across broad parameters. This leaves opacity to be the origin of the broadness. Since Fe-group elements have higher opacity than intermediate mass elements (IME), and more Ni-56 implies more Fe-group/IME, it is to be expected that high Ni-56 implies high opacity that implies broader light curve.
The slide, that someone provided in your comment, explains the same idea here (with more references).
answered 1 hour ago
Kornpob Bhirombhakdi
5885
edited 1 hour ago
answered 1 hour ago
Kornpob Bhirombhakdi
5885
answered 1 hour ago
Kornpob Bhirombhakdi
5885
answered 1 hour ago
Kornpob Bhirombhakdi
5885
5885
add a comment |Â
add a comment |Â
Noriaki822 is a new contributor. Be nice, and check out our Code of Conduct.
Noriaki822 is a new contributor. Be nice, and check out our Code of Conduct.
Noriaki822 is a new contributor. Be nice, and check out our Code of Conduct.
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There isn't, to my knowledge, an accepted theoretical explanation, but there are several hypotheses. Adam Burrows has these helpful slides on the topic.
– pela
5 hours ago