Questions tagged [light-curve]
Questions about the time-dependence of the light intensity of a celestial object or region.
62
questions
2
votes
0
answers
27
views
Using data from the Fine Guidance System (HST)
Has anyone been able to successfully use data from the Hubble Space Telescope's fine guidance system in order to create light curves?
I found a bunch of older papers that reference this instrument, ...
16
votes
2
answers
3k
views
Why does Mars have a jagged light curve?
Caption:
The following chart is the predicted light curve (visual magnitude as a function of time) of Mars, according to the most recent ephemeris data. Magnitude data is sampled with a 2 days ...
1
vote
0
answers
42
views
plotting light curve for x ray data
how can I plot the light curve for Chandra X-ray data? I want to extract the counts within the specified energy range from the light curve.
e.g., I have to extract the counts within the energy range ...
4
votes
1
answer
443
views
Light curves for Chandra
I am working with Chandra data. I only have the corrected PI files for the sources. Is there a way to plot the light curve from this PI file. I wanted to extract the color magnitude ultimately.
0
votes
1
answer
50
views
Resource suggestions?
If I want to research binary stars (to find out about their properties from their light curves) and I need to know how to interpret light curves for the same, what would be a good resource to refer to?...
0
votes
0
answers
42
views
Looking for feedback for my python GUI: visualise exoplanet transit and simulate atmospheric temperature
This isn't necessarily an astronomy question (although there may be plenty of astronomy errors in my GUI), and I apologise in advance if this kind of thing is not allowed here and the question is to ...
4
votes
2
answers
417
views
On the "periodic" lightcurves of Active Galactic Nuclei
So apparently they are all lightcurves of (likely candidates) Active Galactic Nuclei and in some way or the other they all appear to be periodic:
I'd like to know the reason for this and the ...
9
votes
1
answer
1k
views
Why did it take so long for SN1987A to reach peak brightness?
The light from SN1987A first reached us on February 23, 1987, and its brightness peaked in mid May, almost 3 months later.
However, every source that I can find states that it normally only takes a ...
1
vote
0
answers
33
views
Differentiating supernova types with light curves
as an introductory activity for my work on transients, I am studying the light curves of different supernovae. It appears that Type-I supernovae have a more pronounced maximum than Type-II supernovae. ...
4
votes
1
answer
538
views
Has the new type II supernova SN 2023ixf's subtype been determined yet, and is a tentative light curve possible? Is it still getting brighter?
Wikipedia's article on SN 2023ixf begins:
SN 2023ixf is a type II (core collapse) supernova located in the Pinwheel Galaxy (M101). It was first observed on May 19, 2023 by Koichi Itagaki and ...
2
votes
0
answers
67
views
Finding the uncertainty in period for String-Length Minimization calculation
I wrote a Python script that calculates the period of an unevenly sampled data set using the String-Length Minimization method.
You can read about that method here: A period-finding method for sparse ...
2
votes
0
answers
35
views
Which value of the apparent magnitude do I use from a Supernova light curve
I am trying to get the distance modulus from a light curve of a supernova and obviously the apparent magnitude changes with time. Not only that but there are so many filters with different mags.
So my ...
3
votes
1
answer
100
views
How to obtain luminosity distance from a light curve
I have some light curve data of a SN Ia from which I want to find the luminosity distance $D_L$.
How can I do it mathematically?
I'll then try to implement the answer using Python.
4
votes
0
answers
107
views
What could successive double dips in the light-curve mean?
I was going through some analysis of the TESS light-curve data and I stumbled upon an interesting example (see below figures, where the blue line is simply a moving average), where the light-curve ...
2
votes
1
answer
377
views
How does one actually fold a light curve?
I'm studying the variable stars (periodic variables with brightness changes repeating over time), and to examine the shape of the light curve it is useful to fold the data points at this period and ...
2
votes
2
answers
90
views
What determines how accurate a particular method is at finding the period between Lomb-Scargle and String Length Minimization?
I've been using the Lomb-Scargle and String Length Minimization methods to find the periods of various astronomical objects with unevenly spaced data. I wanted to see if I could find any patterns ...
4
votes
1
answer
385
views
How do I get temperature and diameter from a light curve?
I recently learned that short-period pulsating stars vary in diameter and temperature when they pulsate. If I have a light curve for such an object, is it possible to calculate its diameter and ...
2
votes
1
answer
57
views
What does a fitted curve for the period of a variable star, tell me about the star?
If I have enough data of a variable star to make a light curve for it's whole period, and If I fit a function to that light curve, can that fitted function tell me anything about the properties of ...
3
votes
2
answers
275
views
Fourier analysis of exoplanet transit to determine the number of planets in the system
Although I think that this can be done by simply looking at the transit graph, I was wondering if a Fourier transform of a transit (basically transforming transit depth/amplitude vs time graph to ...
1
vote
0
answers
120
views
easy curve modeling package for transits that fits the data not just the parameters?
Does anyone have any recommendations for easy-to-use exoplanet transit light curve model fitting packages like batman, but that fits the data, not just the model parameters?
Thank you so much. I need ...
10
votes
1
answer
523
views
Gravitational mirroring: Can we theoretically see the Milky Way using a telescope?
As I am watching the beautiful deep field picture of the James Webb Space Telescope. I noticed the gravitational lensing. So I asked myself whether it is possible somehow a successive cluster of ...
3
votes
1
answer
251
views
creating asteroid light curves and analysing them
I came across the video Tutorial: Creating a Lightcurve of a Minor Planet linked below by Tycho Tracker, which itself is a software to build an asteroid light curve from raw images and analyse it to ...
2
votes
1
answer
2k
views
How do I phase fold the light curve for a variable star?
I have some observational data for a star where I've done aperture photometry to get a partial period. I understand that you need to use other techniques to estimate a period for stars whose period is ...
5
votes
1
answer
140
views
How do you tell if a variable star is periodic or not by its light curve?
I have light curves for a particular star. I'm able to construct a periodogram of the stars' light curve, a plot of the power of the light curve vs. the signal's period. For a nonperiodic but ...
1
vote
0
answers
149
views
Simulating Light Curve with the Timmer & Koenig method in Python
How to simulate the light curve using the Timmer & Koenig method in python with error bars in each counts generated by that method. I have used astro ML but I doesn't show the error in the counts. ...
5
votes
1
answer
132
views
Sudden spikes on the light curve of a Quasar from K2 mission
I obtained the optical light curve of 3C 273 QSO from the MAST repository off the K2 mission and plotted it by making the FITS into a CSV file through Pandas dataframe and plotting the obtained ...
2
votes
1
answer
59
views
Obtaining the Flux-Time plot for a Quasar
As a follow up question to Obtaining the Light curve of a a Quasar, I wish to know how to obtain a Light curve for a quasar observation like this data set over here.
Is there an archival repository ...
3
votes
1
answer
91
views
Obtaining the Light curve of a a Quasar
So, I am relatively comfortable with handling $\textit{FITS}$ files and hence I choose Python for the following operation.
The thing is that I need to analyse some Quasar light curves and hence I went ...
0
votes
1
answer
247
views
How to find luminosity from a light curve? [closed]
I am currently trying to find the luminosity from the light curve. I have the data about the distance, counts/sec and the energy range in which it is measured for an object. What equation can be used ...
1
vote
0
answers
46
views
Procedure to construct a spectral energy distribution and bolometric light curve of supernovae?
Can anyone check the logic of this proposed workflow and/or point me in the direction of a guide and example to check my work?
Proposed procedure to construct a spectral energy distribution and ...